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4.2x0.5用简便算法

4.2×0.5 =4×0.5+0.2×0.5 =2+0.1 =2.1

请参考

错,4.2除0.5等于0.5除以4.2=(0.5)÷4.2=5/82

7.5x2.4+2.4x2.5 =2.4×(7.5+2.5) =2.4×10 =24 3.72x3.5+6.28x3.5 =3.5×(3.72+6.28) =3.5×10 =35 (4+0.4)x2.5 =4×2.5+0.4×2.5 =10+1 =11 4.2x0.5-1.6x0.5 =(4.2-.1.6)×0.5 =2.6×0.5 =1.3

4.2➗【1.5+7.5x(5.94-0.54)】 =4.2÷(1.5+7.5x5.4) =4.2÷(1.5+40.5) =4.2÷42 =0.1 这题没有简便方法,直接计算

4.8-2.4×4.2 =2.4x2-2.4x4.2 =2.4x(2-4.2) =2.4x(-2.2) =-2.4x(2+0.2) =-2.4x2-2.4x0.2 =-4.8-0.48 =-5.28

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第一个 2.5x=-1.6 x=-0.64 第二个 5x+20=26.6-x 6x=6.6 x=1.1 第三个 2x=13.6 x=6.8

4.31x0.99=4.31x(1-0.01)=4.31x1-4.31x0.01=4.31-0.0431=4.2669

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