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4.8%4.8x0.5的梯式简便运算

(10-6.35×0.8)×0.5 =10X0.5-6.35X0.8X0.5 =5-6.35X0.4 =5-2.54 =2.46

(8x6+8x4+6x4)x0.5 =(48+32+24)x0.5 =48x0.5+32x0.5+24x0.5 =24+16+12 =52

0.5X(7-4X4/9) =0.5X(63/9-16/9) =1/2X47/9 =47/18 =2又18分之11

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