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1、小数混合运算专项训练1、解方程。(1) 5x=450(3) 1.2 X 6+4x= 122、用简便方法计算。(1)0.25 X 3.2 X 12.5(3) 0.25 X 443、用递等式计算。(1) 2.6+1.4 X 1.5 1.5(2) 12 (6 x)= 42(4) 8.5x x = 22.5(2) 36X 10.1(4) 22. 2X 4+17. 8X4(2)( 37 3.6 - 4.8 )- 12.5(3) 2.6+2.4 X( 1.4 1.05)(4) 15.6 - 16X( 0.25+1.25 )30.8 - 14-(9.85+1.07)60-(9.5+28.9)- 0.182.
2、881 - 0.43-0.24 X 3.520X (2.44 -1.8) - 0.4+0.1528- (3.4+1.25 X 2.4)2.55 X 7.1+2.45 X 7.1777X 9+1111X30.8 X 15.5 -(3.21+5.79)31.5 X 4- (6+3)(31.8+3.2 X 4) - 52.55 X 7.1+2.45 X 7.1777X 9+1111X 3(31.8+3.2 X 4)十 50.64 X 25X 7.8+2.22* 2.5+2.5 * 236.25 - 4.25 X 9.95180705X 624- 2.4 2.5 X 0.8(4121+2389) *
3、7671X 15-974469X 12+149219.4 X 6.1 X 2.35.67 X 0.2 -0.6218.1 X 0.92+3.930.4 X 0.7 X 0.250.78+5.436+14. 8 X 5 * 4+1* 49. 9x5 * 6+5* 610. 3 宁 4x8*9 -1* 314. 31x5 *6-5*616. 5 * 9x18-14x2* 720. 3x2 * 9+1* 335. 95 *( 64-45)36. 178-145* 5X 6+427.2 * 0.8-1.2 X 56.5 X( 4.8- 1.2 X 4)28-(3.4+1.25 X 2.4)24- 2.
4、4 2.5 X 0.8(4121+2389) - 7671X 15-974469X 12+1492405X (3213-3189)19.4 X 6.1 X 2.35.67 X 0.2 -0.6218.1 X 0.92+3.930.043 X 24+0.87531.5 X 4- (6+3)0.64 X 25X 7.8+2.22-2.5+2.5 - 2194-64.8 - 1.8 X 0.936.72 - 4.25 X 9.95180 705X 60.4 X 0.7 X 0.250.78+5.436+14.07 X 0.86+9.12240X 78- (154-115)1437X 27+ 27X
5、56375- (12+18)- 15325- 13X (266 250)2160-( 83-79) X 18280 + 840- 24 X 585X (95 1440- 24)58870- (105 + 20X 2)1437X 27+ 27X 563(7.85+6.4 ) X 3081432- (13 X 52+ 78)37.85-(947 599)+ 76 X 6436 X (913 276- 23)192(54+ 38) X 6781432十(13 X 52+ 78)(947 599)+ 76 X 6460 (9.5 + 28.9) - 0.182.881 - 0.43 0.24 X 3.
6、50.8 X 15.5-(3.21+5.79)(31.8 3.2 X4)-5194-64.8 - 1.8 X 0.936.72 - 4.25 X 9.93.416 -(0.016 X 35)0.8 X (10 6.76) - 1.2(6.8-6.8 X 0.55) - 8.50.12 X 4.8 - 0.12 X 4.8(58+37)十(64-9 X 5)812-700-( 9+31X 11)156X (17.7 -7.2) - 3(3.2 X 1.5+2.5 )- 1.685+14X( 14+208- 26)120- 36 X 4- 18+359.72 X 1.6-18.305 - 73.2
7、 X (1.5+2.5 ) - 1.6(58+37) - (64-9 X 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 ) - 1.6120- 36 X 4- 18+3515-10.75 X 0.4 -5.7347+45X2-4160- 52(58+37)-( 64-9 X 5)(7.1-5.6 )X 0.9-1.15 -2.5(3.2 X 1.5+2.5 )- 1.65.4 - 2.6 X( 3.7-2.9 ) +0.6212X 6-( 12-7.2 ) -63.2 X 6+ ( 1.5+2.5 ) - 1.6(
8、3.2 X 1.5+2.5 )- 1.6 120-144十 18+35 347+45X2-4160十 52(58+37)-( 64-9 X 5) 95-( 64-45) 812-700-( 9+31X 11) 120- 36 X 4- 18+35 (6.8- 6.8 X 0.55) - 8.50.12 X 4.8 - 0.12 X 4.80.8 X 15.5-(3.21+5.79)(31.8+3.2 X 4)- 531.5 X 4- (6+3)0.64 X 25X 7.8+2.22-2.5+2.5 - 2194-64.8 - 1.8 X 0.936.72 - 4.25 X 9.9 5180-7
9、05X 624- 2.4 2.5 X 0.8 (4121+2389) - 7 671X 15-974 469X 12+1492 405X (3213-3189)0.8 X (10 6.76) - 1.2 19.4 X 6.1 X 245.67 X 0.2 -0.62 18.1 X 0.92+3.93 24+0.875 X 99 0.4 X 0.7 X 0.25 0.75 X 102100-56.2331.50 + 160- 40(58+370)-( 64-45) 32.120- 144- 18+35 33.347+45X2-4160-52 34 (58+37)-( 64-9 X 5) 35.9
10、5 -(64-45) 36.178- 145- 5X 6+42 420+580-64 X 21-28 37.812- 700-( 9+31X 11)(136+64)X( 65-345十 23) 38.85+14 X( 14+208- 26) 120- 36 X 4- 18+35(58+37)-( 64-9 X 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 ) - 1.631.50 + 160- 40(58+370)-( 64-45)32.120- 144- 18+35 33
11、.347+45X2-4160-5234 (58+37)-( 64-9 X 5) 35.95 -(64-45)36.178- 145- 5X 6+42420+580- 64 X 21-28812-700-( 9+31X 11)(136+64)X( 65- 345- 23)(284+16)X( 512-8208-18) 120- 36 X 4- 18+35(58+37)-( 64-9 X 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 )- 1.6(23.2 X( 1.5+2.5 ) - 1.645.6- 1.6 - 4=5.38+7.85-5.37=46.7 - 0.8-1.2 X 5=6-1.19 X3 -0.43=47.6.5 X( 4.8- 1.2 X 4)=0.68 X 1.9+0.32 X 1.9297X 9991983X 21+21X 3017(0.123+123) X100934X24+34810.8 X 0.196+0.094105+895X 5732.47 X 23+2739.01 X 18.3-90176.5+2- 2X 18449+23X 1431 X 9952X99+5225X 32X 125
