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(7.5一2.3x0.4)÷0.02脱式计算

3.96+0.4=4 3.2*0.5=1.6 4+1.6=5.6

2.5*4*2.2=22

你好! 125×7×24 = 125×7×3×8 = (125×8)×(7×3) = 1000×21 = 21000 0.72 + 0.28×1.5÷2.1 = 0.72 + 0.4×0.7×1.5 ÷ (3×0.7) = 0.72 + 0.4×1.5 ÷ 3 = 0.72 + 0.4×0.5 = 0.72 + 0.2 = 0.74 2/3 x + 2/5 x = 4/5 10/15 x + 6/15 x = 4/5 16/15 x = 4/5...

×÷7.2+0.2=0.3 解:×÷7.2=0.3-0.2 ×÷7.2=0.1 ×=0.1×7.2 x=0.72 ×÷7.2-0.2=0.3 解:×÷7.2=0.3+0.2 ×÷7.2=0.5 ×=0.5×7.2 x=3.6

(15分) (1)5 4 +(8 3 -4 1 )(2)2-7 ...5、 = = =12÷()=( )(填小数)6、12和15的...3、脱式计算,能简算的要简算(9分,每小题3分)...

简便运算 1.4x0.27x25 2.560÷16÷5 3.3.8x99+3.8 4.(8+4/9)÷4 5.2/5+3/7+3/5+4/7 6.7/16x9-7/16x7 7.0.4x(12x2.5) 8.(3.8-1.8÷2)x0.5 9.1/4x4÷1/4x4 10.8/13÷7+1/7x5/13 解方程: 1.30x=15 2.50%x-30=52 3.16+4x=40 4.x+0.5x=6 5.3x+1/2=5/3 6.x-...

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