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5/7X一2.5=17.5,1/4X+3/5Ⅹ=17/8

5/7X一2.5=17.5 5X/7=17.5+2.5 X=20*7/5 X=28 1/4X+3/5Ⅹ=17/8 5X/20+12X/5=17/8 17X/5=17/8 X=17/8*5/17 X=5/8

1. 3X(-9)+7X(-9) =-27-63 =-90 2. 【5/6÷(-1/2-1/3)+17/8】÷(-9/8) =[5/6÷(-5/6)+17/8]*(-8/9) =[-1+17/8]*(-8/9) =9/8*(-8/9) =-1

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