一、小数加减乘除及混合运算

1、一、小数加减乘除及混合运算（含简便运算）1.计算下面各题，能简算的用简便方法算，并写出简算过程。1.6 X3.9 X1.2535.72 P.047 P.323.6 T0.10.138 6.4 P.121P.25 X(1.28 为.2 )4.87 X2.34+48.7 0.2666.25 - 0.25 668.04(0.21 X 3.6 )0.486 + 0.01 + 3.9919.752.5-3.5517.5 2.3-7.5 2.31.25 11 X 4 0.890 - 25 - 48.93 5.7 + 8.93 X 3.3 + 8.93一、直接写出得数：（10 分）0.27 3 =7.2一

2、0.6 =1.25X 8 =:0.83+ 0.270.09 0.4 =10 一 0.1 =6.5一 1.3=2.8-1.09 =2.5 4.4 =8.8X 101 =0. 45X2. 5=0.8X1.25 =0. 3X3.6 =0.3X0. 3=10X0. 07 =0. 3X1.4=6 05X7 =0. 92X0. 4 =0. 2 X 01 26=0. 14X4 =0. 02X0-1 =1. 2X0. 3=0. 2X0, 4 =8. 2+1.8 =100-35. 22 =2*3X4二2. 5 X 01 4 =2. 4X5=0. 22X4=3.25X6 5二(L 90. 52=3. 99X1 =

3、0X3. 52 =12. 5X8-8 于 10 =10-1,8-7. 2=0. 43+3. 57=2.5X4X12=0.9X0. 8=7. 5x-3x=a+3a+7a=L 05X100-14-0. 5=0 96W3二L47-r0. 7=5.4 6二(L 16.5X10-6 56X100=3. 78X100=4-rO. 8二3.215X100=0,8X10=4. 08X100=1,1X0.2 =0.6X0. 8 =3X0. 9=2. 5X0. 4二3.6X0. 4二12.5X8=50 X 6 04=80X0.3 =11X9=6 16X5=1.78+2.2 =9E0.6 =1, 2X0. 5=山7

4、刊01二2,5X0.4 二12-3. 9=6,6-rO. 66=3.9+2* 03=42三3.5=L 6+2. 4X0.3-2. 14-0.9=27+456+73二0. 3X0. 3=7.2+2, 8=0t 94-0. 01 =12 弓 0. 3=2. 874-0.7 =1324 =0.96刊 3=1. 5X0* 4=74-0. 25 =2. 5X0, 7X0. 8= 82. 5=下载*85.44 +6 =67.5 +5 =101.7 +9 =243.2 M4 =15.6 +24 =0.138 +15 =0+ 125X322.8X9,6+18X2.8-2.8L72X L44-L72XL44,3

5、4 X 2.73 + 56.6X0.24. 1X3. 5X2101X t 55.6XW2202X1.44234X1022.25X9912.9X98133X977.2X37 7.2X33L25X84-76XL2527X5.6 25X5.6935 X 65 2. 35X653.77X1.89.99X0, 02L 666X6.14.88X2.95,5X55计算：68.8 F =289.9 -18 =16.8 吃8 =(k 78X10119X9.9+9.9102X5.6-5.6X20.SX37X1.25136 X 4. 06+4. 06 X6423X1022.01X992.03X103101X0, 5

6、4245X991.03 X 981.34X97181X7 7X8. I34X78-3.4X2870X6,4 70X0. 413.9X81- 13.90.02X964.67X0.99.432X()JK)25.61X4.39.77X0. 023.26X5.7-3.26X0*70.79X115471X0.25-0.25X714. 3XL5X67.02X123+877X7.02101X 6.7078 X102106X8.58.8X102L26X98132X9771X99-9967X9.2 67X0,29.8X11-9.86,2X56 6.2X65. 6X2. 95.22X0. 35X2.445.6X6. 5& 9X2.4L 384X5, I1.35 切=0.416 +32 =3.64 +52 =91.2 38 =26P13 =10.6