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4.2x0.5用简便算法

用4.2×5个0.1

请参考

4.2×0.5 =4.2×1/2 =4.2÷2 =2.1

问: 4.2X0.5—1.6X0.5简便计算 答 4.2×0.5﹣1.6×0.5=9(4.2-1.6)×0.5 =2.6×0.5 =1.3

5.8+4.2x0.5 =5.8+(4+0.2)x0.5 =5.8+2+0.1 =7.9

4.2*1.2-5.2*0.7 =0.7*6*1.2-5.2*0.7 =0.7*7.2-5.2*0.7 =0.7*(7.2-5.2) =0.7*2 =1.4

(4.2÷0.8一0.5)x0.2 =4.2÷4-0.1 =1.05-0.1 =0.95

4.2×2.3÷0.35 =0.7×6×2.3÷0.7÷0.5 =(0.7÷0.7)×(6×2.3×2)÷(0.5×2) =1×6×4.6÷1 =6×(5-0.4) =6×5-6×0.4 =30-2.4 =27.6

只说方法,不给结果 (1.7x2.5x4.2)/(0.5x0.7x3.4)=1.7与3.4约分;2.5与0.5约分;4.2与0.7约分; 0.035x935+0.035+3x0.035+0.7x61x0.5=提取公因数0.035;0.7x0.5=0.035 20022003x20032002-20022002x20032003=(20022002+1)x20032002-20022002x(2...

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