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102x2.97简边远算

102X0.55=100*0.55+2*0.55=55+1.1=56.1 希望能帮到你,请采纳正确答案.你的点赞或采纳是我继续帮助其他人的动力

102x0.34 简算怎么算?= (100+2)*0.34= 34 + 0.68= 34.68

102x0.56=(100+2)*0.56=100*0.56+2*0.56=56+1.12=57.12

102x3.45=(100+2)*3.45=100*3.45+2*3.45=345+6.9=351.9

102x0.55=(100+2)x0.55=100x0.55+2x0.55=55+1.1=56.1

3.42*102=3.42*(100+2)=3.42*100+3.42*2=342+6.84=348.84

原式=(100+2)x0.87=100x0.87+2x0.87=87+1.74=88.74 供参考.

运用乘法分配律,把两数相乘化为一个数乘两个数相加的和.102是100+几的数,所以就把102化为100+2 则:102*0.42=(100+2)*0.42=100*0.42+2*0.42=42+0.84=42.84

=(100+2)*0.32=100*0.32+2*0.32=32+0.64=32.64

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