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4.8%4.8x0.5的梯式简便运算

2.4x1.2x0.5 =2.4x(1.2x0.5) =2.4x0.6 =1.44

先把后面相乘,得到1  之后在除得1.68

( 0.6x3.7+5x1.08+9.72x0.5)x2梯等式计算 =(2.22+5.4+4.86)x2 =12.48x2 =24.96

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