小数混合运算计算题

1、2、列竖式计算。( 6 分)(1) 2. 58 X 3.53、解方程。( 12 分)(1) 5x=450(3) 1.2 X 6+4x= 124、用简便方法计算。( 8 分)(1) 0.25 X3.2X12.5(3) 0.25X 445、用递等式计算。( 12 分)(1) 2.6+1.4X1.51.5(3) 2.6+2.4 X( 1.41.05)30.8 - 14-(9.85+1.07) 60- (9.5+28.9)- 0.182.881 - 0.43-0.24 X 3.520X (2.44 -1.8) - 0.4+0.1528-(3.4+1.25X2.4) 2.55X7.1+2.45X7.17

2、77X 9+1111X3 0.8X15.5 -(3.21+5.79)(31.8+3.2 X 4) - 531.5 X 4- (6+3)0.64X 25X 7.8+2.22-2.5+2.5 - 236.25 - 4.25 X 9.9 5180705X 624- 2.4 2.5 X 0.8 (4121+2389) - 7 671X15-974 469X 12+1492 19.4X 6.1 X 2.3 5.67X0.2-0.62 18.1 X 0.92+3.93 0.4X 0.7X 0.25 0.78+5.436+1 4. 8 X 5 宁 4+1* 49. 9x5 * 6+5* 610. 3 * 4

3、x8*9-1 * 3 14. 31x5 *6-5* 6 16. 5 * 9x18-14x2* 7 20. 3x2 * 9+1* 335. 95 *( 64-45)36. 178- 145* 5X 6+422) 3.572*0.47(3) 329*22(2) 12 (6x)= 42(4) 8.5x x = 22.5(2) 36X 10.1( 4) 22.2X 4+17. 8X4(2)(373.6*4.8)*12.5 (4) 15.6*16X(0.25+1.25) 7.2*0.8-1.2X5 6.5X (4.8- 1.2X4) 28-(3.4+1.25 X2.4) 2.55X7.1+2.45X7.

4、1 777X 9+1111X 3(31.8+3.2 X 4)* 5 31.5X4*(6+3) 0.64X 25X 7.8+2.2 2* 2.5+2.5 * 2 19464.8*1.8X0.9 36.72*4.25X9.9 5180 705X 6 24*2.42.5X0.8 (4121+2389) * 7 671X15-974 469X 12+1492 405X (3213-3189) 19.4X 6.1 X 2.3 5.67X0.2-0.62 18.1 X 0.92+3.93 0.043X 24+0.875 0.4X 0.7X 0.25 0.78+5.436+1 4.07X0.86+9.12

5、240X 78*( 154-115) 1437X 2727X 563 75-(12+18)* 15 2160*( 83-79)X 18 280840* 24X 5 325* 13X (266 250) 85X(951440*24)58870十(105 + 20X 2)1437X 27+ 27X 563 81432- (13 X 52+ 78)37.85- (7.85+6.4 ) X 30 156X (17.7 -7.2) - 3(947 599) 76 X 6436 X (913 276- 23)192 ( 5438) X 6781432- (13 X 52+ 78) (947 599) 76

6、X 6460 (9.5 + 28.9) - 0.182.881 - 0.43 0.24 X 3.5 0.8X15.5-(3.21+5.79)(31.8 3.2 X 4)-5194 64.8 - 1.8 X 0.936.72-4.25X9.9 3.416-(0.016X35) 0.8X(106.76)-1.2(6.8- 6.8X0.55) -8.5 0.12X 4.8 -0.12X4.8(58+37)-( 64-9X 5) 812-700-(9+31X11)(3.2X1.5+2.5)-1.6 85+14X( 14+208- 26) 120-36X4-18+35 9.72X1.6-18.305-7

7、 3.2X (1.5+2.5 ) -1.6(58+37)-( 64-9X 5)(6.8- 6.8X0.55) -8.50.12X 4.8 -0.12X4.8 (3.2X1.5+2.5)-1.6120-36X4-18+35.15- 10.75X0.4-5.7 347+45X2-4160- 52(58+37)-( 64-9X 5) (7.1-5.6 )X0.9-1.15 -2.5(3.2X1.5+2.5)-1.6 5.4-2.6 X (3.7-2.9 ) +0.62 12X 6-( 12-7.2 ) -6 3.2X6+(1.5+2.5 )-1.6(3.2X1.5+2.5)-1.6120-144-1

8、8+35347+45X2-4160- 52 (58+37)-( 64-9X 5)95-( 64-45) 812-700-(9+31X11) 120-36X4-18+35(6.8- 6.8X0.55) -8.5 0.12X 4.8 -0.12X4.80.8X15.5-(3.21+5.79)(31.8+3.2 X 4)- 531.5X4-(6+3)0.64X 25X 7.8+2.22- 2.5+2.5 - 2 19464.8-1.8X0.9 36.72-4.25X9.9 5180 705X 6 24-2.42.5X0.8 (4121+2389) - 7 671X15-974 469X 12+149

9、2 405X (3213-3189)0.8 X(10 6.76) -1.2 19.4X 6.1 X 245.67X0.2-0.6218.1 X 0.92+3.9324+0.875X 990.4X 0.7X 0.250.75X102100-56.23 31.50160-40(58+370)-( 64-45 ) 32.120- 144-18+35 33.347+45X2-4160-52 34 (58+37) - ( 64-9X 5) 35.95-(64-45) 36.178-145-5X6+42 420+580-64X21-28 37.812-700-(9+31X11)(136+64) X (65

10、-345-23) 38.85+14X (14+208-26) 120-36X4-18+35(58+37)-( 64-9X 5)(6.8- 6.8 X 0.55) - 8.50.12 X 4.8 - 0.12 X 4.8(3.2 X 1.5+2.5 )- 1.63.2 X( 1.5+2.5 ) - 1.6 31.50 + 160- 40(58+370)十(64-45) 32.120- 144- 18+35 33.347+45X2-4160-52 34 (58+37)-( 64-9 X 5) 35.95 -(64-45) 36.178- 145- 5X 6+42 420+580- 64 X 21-28 812-700-( 9+31X 11)(136+64)X( 65- 345- 23) 1983X21+21X3017 (0.123+123) X1009 34X 24+3481 0.8X0.196+0.094 105+895X 57 32.47X 23+27 39.01 X18.3-901 76.5+2- 2X184 49+23X 14 31X 99 52X 99+52 25X 32X 125(284+16)X(512-8208-18)120-36X4-18+35(58+37)-( 64-9X 5)(6.8- 6.8X