(+71/4)-(+6.25)-(-17/2)-(+0.75)-89/4 要过程
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(+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
=71/4-25/4+17/4-1/4-89/4
=(71-25+17-1-89)/4
=-27/4
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-27÷9/4×(-9/4)+4-4×(-3/1) 要过程
追答
-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
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