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1/1X4+1/4X7+1/7X10+1/10X13+1/13X16(简算)

1/1x4+1/4x7+1/7x10+1/10x13+1/13X16 =(1/3) × [ (1...

原式=(1-1/4+1/4-1/7)+1/7-1/10+1/10-1/13)x1/3 =(1-1/...

分子分母同乘同除一个数,相等

原式=1/3×(1-1/4)+1/3×(1/4-1/7)+1/3×(1/7-1/10)+1/3×(1...

1x4/1+4x7/1+7x10/1+.+100x103/1 =3/1x[1x4/(4-1)+4x...

27/7-7-17/7+(-1/7)+|-3|-(-4) =27/7-7-17/7-1/7+3+4 ...

1.某超市推出如下优惠方案:(1)购物款不超过200元不享受优惠;(2)购物款超过200元但不超过6...

上面的答案都正确。不知道楼主是不是把题目写错了,就是分子和分母的位置弄反了,如果是的话1/1*2+1...

(1/1-1/16)×1/(4-1) =15/16×1/3 =5/16

原式=1/3×(1-1/4)+1/3×(1/4-1/7)+1/3×(1/7-1/10)+1/3×(1...

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