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(+71/4)-(+6.25)-(-17/2)-(+0.75)-89/4

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(+71/4)-(+6.25)-(-17/2)-(+0.75)-89/4
(+71/4)-(+6.25)-(-17/2)-(+0.75)-89/4
(+71/4)-(+6.25)-(-17/2)-(+0.75)-89/4
=71/4-25/4+17/4-1/4-89/4
=(71-25+17-1-89)/4
=-27/4
再问: -27÷9/4×(-9/4)+4-4×(-3/1) 要过程
再答: -27÷9/4×(-9/4)+4-4×(-3/1) =-27×4/9×(-9/4)+4-4×(-3/1) =27+4-3/4 =31-3/4 =29又3/2
再问: (-2/3)×1/2+(-1/3)+(-0.5) 要过程
再答: (-2/3)×1/2+(-1/3)+(-0.5) =-1/3-1/3-1/2 =-2/3-1/2 =-7/6
再问: (2/3-1/4-3/8)×(-24) 要过程
再答: (2/3-1/4-3/8)×(-24) =-2/3×24+1/4×24+3/8×24 =-16+6+9 =-1 事不过三,再追问就要扣分了,有问题再发到网上啊