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78.5X0.81+7.85x1.9的脱式计算

78.5X0.81+7.85x1.9 =63.585+14.915 =78.5

4/5x4+2/5x2+1/5x16 =16/5+4/5+16/5 =36/5 =7.2

12.5x0.64x2.5 =(12.5x0.8)x(0.4x2.5x2) =10x2 =20

参差荇菜,左右采之.窈窕淑女,琴瑟友之.

12.5x9.6 =12.5x8x1.2 =100x1.2 =120 -----------------------------------------------------------------------------------------

12.5X(8+0.8) =12.5×8+12.5×0.8 =100+10 =110

36.5-36.5x0.95 = 36.5 x (1 - 0.95) = 36.5 x 0.05 = 1.825

2.65x1.7+13.5x0.17 =1.7*【2.65+1.35】 =1.7*4 =6.8 满意采纳

2.5x45x0.4 =2.5x0.4x45 =1x45 =45

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