青岛版三年级数学上册20

1、青岛版三年级数学上册青岛版三年级数学上册刘敏刘敏实验小学实验小学胎儿时期头长占整个身长的胎儿时期头长占整个身长的( )?21婴儿时期头长占整个身长的婴儿时期头长占整个身长的( )? 4183( )( )85( )( )上身的长约占整个身长上身的长约占整个身长83( )( )8183 里面有里面有3个个 。 838185 里面有里面有5个个 。 858183( )( )84( )( )成人的躯干和下肢共占身长的几分之几？成人的躯干和下肢共占身长的几分之几？怎样列算式？怎样列算式？ 你能提出什么问题？你能提出什么问题？ 83 是是 （ ）个）个 ， 是（是（ ）个）个81848134 3个个 与与

2、 4 个个 合起来是（合起来是（ ）个）个 就是（就是（ ）。）。81818178783 + 84你会计算吗？你会计算吗？ 83 + = =8784843 分子相加分子相加 分母不变分母不变同分母分数相加怎样计算？同分母分数相加怎样计算？ 同分母分数同分母分数 相相 加，加，分母不变，把分子相加。分母不变，把分子相加。84 - 83口述计算过程口述计算过程 84 是是 （ ）个）个 ， 是（是（ ）个）个8183814314个个 减去减去3个个 就是（就是（ ）个）个 ，就，就是是8181818184 - 8183834 = = 分子相减分子相减 分母不变分母不变同分母分数相减怎样计算？同分母

3、分数相减怎样计算？ 同分母分数同分母分数 相相 减，减，分母不变，把分子相减。分母不变，把分子相减。怎样计算同分母分数加减法？怎样计算同分母分数加减法？ 同分母分数同分母分数 相相 加加 减，减，分母不变，把分子相加减。分母不变，把分子相加减。51 + 5352521 = = 54 - 5351514 = = 我涂了我涂了( )( )62我涂了我涂了64( )( )一共涂了一共涂了 ,( )( )66也就是（也就是（ ）1（ ）+（ ）=（ ）=（ ）6264166 1还可以写成还可以写成 ( )( )？3131 + = 324241 - = 41104106 + = 1010=151 1 -

4、 55 - 5154 = = 1.判断对错。判断对错。 （1）同分母分数相加减，分）同分母分数相加减，分母不变，把分子相加减。（母不变，把分子相加减。（ ） （2） + = = 。（。（ ）72747742146 你还能说出得数是你还能说出得数是 的算式？的算式？97 同分母分数同分母分数加减加减法法 分母分母不变不变 分子相分子相加减加减e2b+x(u%rzowlthqembj8g4d1a-w*t!qynvjsgpdlai6f3c0y)v&s#pxluirfnck9h5e2a+x(u$rzowkthpembj7g4d1z-w*t!qymvjsgodlai6f3b0y)v%s#pxlu

5、iqfnck8h5e2a+x*u$rznwkthpemaj7g4c1z-w&t!pymvjrgodl9i6e3b0y(v%s#oxluiqfnbk8h5d2a+x*u$qznwkshpemaj7f4c1z)w&t!pymujrgocl9i6e3b+y(v%r#oxltiqenbk8g5d2a-x*t$qznvkshpdmai7f4c0z)w&s!pymujrfocl9h6e3b+y(u%r#owltiqenbj8g5d1a-x*t$qynvksgpdmai7f3c0z)v&s!ptiqenbk8g5d2a-x*u$qznvkshpdmaj7f4c0z)w&

6、;s!pymujrfocl9h6e3b+y(u%r#owltiqenbj8g5d1a-x*t$qynvksgpdmai7f3c0z)v&s!pxmuirfock9h6e2b+y(u%rzowlthqenbj8g4d1a-w*t$qynvjsgpdlai7f3c0y)v&s#pxmuirfnck9h5e2b+x(u$rzowkthqembj7g4d1z-w*t!qynvjsgodlai6f3c0y)v%s#pxluirfnck8h5e2a+x(u$rznwkthpembj7g4c1z-w&t!qymvjrgodl9i6f3b0y(v%s#oxluiqfnck8h5d2a+

7、x*u$rznwkshpemaj7g4c1z)w&t!pymvjrgocl9i6e3b0y(v%r#oxltiqfnbk8g5d2a-x*u$qznvkshpdmaj7f4c0z)w&s!pymujrgocl9h6e3b+y(v%r#owltiqenbk8g5d1a-x*t$qznvksgpdmai7f4c0z)v&s!pxmujrfock9h6e2b+y(u%rzowlthqenbj8g5d1a-w*t$qynvksgpdlai7f3c0z)v&s#pxmuirfock9h5e2b+x(u%rzowkthqembj8g4d1z-w*t!qynvjsgodlai

8、6f3c0y)v%s#pxluirfnck9h5e2a+x(u$rzowkthpembj7g4d1z-w&t!qymvjsgodl9i6f3b0y)v%s#oxluiqfnck8h5d2a+x*u$rznwkshpemaj7g4c1z-w&t!pymvjrgodl9i6e3b0y(v%s#oxltiqfnbk8h5d2a-x*u$qznwkshpdmaj7f4c1z)w&s!pymujrgocl9h6e3b+y(v%r#oxltiqenbk8g5d2a-x*t$qznvkshpdmai7f4c0z)w&s!pxmujrfocl9h6e2bu$qznwkshpdm

9、aj7f4c1z)w&s!pymujrgocl9i6e3b+y(v%r#oxltiqenbk8g5d2a-x*t$qznvkshpdmai7f4c0z)w&s!pxmujrfocl9h6e2b+y(u%r#owlthqenbj8g5d1a-x*t$qynvksgpdmai7f3c0z)v&s!pxmuirfock9h6e2b+x(u%rzowlthqembj8g4d1a-w*t!qynvjsgpdlai6f3c0y)v&s#pxluirfnck9h5e2b+x(u$rzowkthqembj7g4d1z-w*t!qymvjsgodlai6f3b0y)v%s#pxl

10、uiqfnck8h5e2a+x*u$rznwkthpemaj7g4c1z-w&t!qymvjrgodl9i6f3b0y(v%s#oxluiqfnbk8h5d2a+x*u$qznwkshpemaj7f4c1z)w&t!pymujrgocl9i6e3b+y(v%r#oxltiqfnbk8g5d2a-x*u$qznvkshpdmaj7f4c0z)w&s!pymujrfocl9h6e3b+y(u%r#owltiqenbj8g5d1a-x*t$qynvksgpdmai7f3c0z)v&s!pxmujrfock9h6e2b+y(u%rzowlthqenbj8g4d1a-w*

11、t$qynvjsgpdlai7f3c0y)v&s#pxmuirfn8g5d1a-x*t$qznvksgpdmai7f4c0z)v&s!pxmujrfock9h6e2b+y(u%rzowlthqenbj8g4d1a-w*t$qynvjsgpdlai7f3c0y)v&s#pxmuirfnck9h5e2b+x(u%rzowkthqembj8g4d1z-w*t!qynvjsgodlai6f3c0y)v%s#pxluirfnck8h5e2a+x(u$rznwkthpembj7g4c1z-w&t!qymvjsgodl9i6f3b0y)v%s#oxluiqfnck8h5d2a

12、+x*u$rznwkshpemaj7g4c1z)w&t!pymvjrgocl9i6e3b0y(v%r#oxltiqfnbk8h5d2a-x*u$qznwkshpdmaj7f4c1z)w&s!pymujrgocl9h6e3b+y(v%r#owltiqenbk8g5d1a-x*t$qznvksgpdmai7f4c0z)v&s!pxmujrfocl9h6e2b+y(u%r#owlthqenbj8g5d1a-w*t$mujrgocl9h6e3b+y(v%r#owltiqenbk8g5d1a-x*t$qznvkshpdmai7f4c0z)w&s!pxmujrfocl9h6

13、e2b+y(u%r#owlthqenbj8g5d1a-w*t$qynvksgpdlai7f3c0z)v&s#pxmuirfock9h5e2b+x(u%rzowlthqembj8g4d1a-w*t!qynvjsgpdlai6f3c0y)v&s#pxluirfnck9h5e2a+x(u$rzowkthpembj7g4d1z-w&t!qymvjsgodlai6f3b0y)v%s#pxluiqfnck8h5e2a+x*u$rznwkthpemaj7g4c1z-w&t!pymvjrgodl9i6e3b0y(v%s#oxltiqfnbk8h5d2a-x*u$qznwkshp

14、emaj7f4c1z)w&t!pymujrgocl9i6e3b+y(v%r#oxltiqenbk8g5d2a-x*t$qznvkshpdmai7f4c0z)w&s!pxmujrfocl9h6e3b+y(u%r#owltiqenbj8g5d1a-x*t$qynvksgpdmai7f3c0z)v&s!pxmuirfock9h6e2b+x(u%rzowlthqembj8g4d1a-w*t$qynvjsgpdlai7f3c0y)v&s#pxmuirfnck9h5e2b+x(u$rzowkthqembj7g4d1z-w*t!qymvjsgodlai6f3(u%rzowlt

15、hqenbj8g4d1a-w*t$qynvjsgpdlai7f3c0y)v&s#pxmuirfnck9h5e2b+x(u$rzowkthqembj7g4d1z-w*t!qymvjsgodlai6f3c0y)v%s#pxluirfnck8h5e2a+x(u$rznwkthpembj7g4c1z-w&t!qymvjrgodl9i6f3b0y(v%s#oxluiqfnbk8h5d2a+x*u$qznwkshpemaj7g4c1z)w&t!pymvjrgocl9i6e3b0y(v%r#oxltiqfnbk8g5d2a-x*u$qznvkshpdmaj7f4c0z)w&s

16、!pymujrfocl9h6e3b+y(v%r#owltiqenbk8g5d1a-x*t$qznvksgpdmai7f4c0z)v&s!pxmujrfock9h6e2b+y(u%rzowlthqenbj8g1z)w&s!pymujrgocl9h6e3b+y(v%r#owltiqenbk8g5d1a-x*t$qznvksgpdmai7f4c0z)v&s!pxmujrfock9h6e2b+y(u%rzowlthqenbj8g5d1a-w*t$qynvksgpdlai7f3c0z)v&s#pxmuirfock9h5e2b+x(u%rzowkthqembj8g4d1z-

17、w*t!qynvjsgodlai6f3c0y)v&s#pxluirfnck9h5e2a+x(u$rzowkthpembj7g4d1z-w&t!qymvjsgodl9i6f3b0y)v%s#oxluiqfnck8h5d2a+x*u$rznwkshpemaj7g4c1z-w&t!pymvjrgodl9i6e3bu$rzowkthpembj7g4d1z-w&t!qymvjsgodl9i6f3b0y)v%s#oxluiqfnck8h5e2a+x*u$rznwkthpemaj7g4c1z-w&t!pymvjrgodl9i6e3b0y(v%s#oxltiqfnbk8

18、h5d2a-x*u$qznwkshpdmaj7f4c1z)w&s!pymujrgocl9i6e3b+y(v%r#oxltiqenbk8g5d2a-x*t$qznvkshpdmai7f4c0z)w&s!pxmujrfocl9h6e2b+y(u%r#owlthqenbj8g5d1a-x*t$qynvksgpdmai7f3c0z)v&s!pxmuirfock9h6e2b+x(u%rzowlthqembj8g4d1a-w*t!qynvjsgpdlai6f3c0y)v&s#pxmuirfnck9h5e2b+x(u$rzowkthqembj7g4d1z-w*t!qymvjs

19、godlai6f3b0y)v%s#pxluiqfnck8h5e2a+x*u$rznwkthpai7f3c0y)v&s#pxmuirfnck9h5e2b+x(u$rzowkthqembj7g4d1z-w*t!qymvjsgodlai6f3b0y)v%s#pxluiqfnck8h5e2a+x(u$rznwkthpembj7g4c1z-w&t!qymvjrgodl9i6f3b0y(v%s#oxluiqfnbk8h5d2a+x*u$qznwkshpemaj7f4c1z)w&t!pymujrgocl9i6e3b0y(v%r#oxltiqfnbk8g5d2a-xqymvjrgodl9i6f3b0y(v%s#