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5/9+x=13/18解方程

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18-9+5x=13.5 9+5x=13.5 5x=4.5 x=0.9

9+5x=13.5 5x=13.5-9 5x=4.5 x=0.9 检验:18-9+5*0.9=13.5

13/18-x=5/12 x=13/18-5/12 x=11/36

(1)x+18=34, x+18-18=34-18, x=58;(2)1724-x=13, 1724-x+x=13+x, 1724=13+x, 1724-13=13+x-13, x=924, x=38;(3)x-(13+14)=512, x-712=512, x-712+712=512+712, x=1.

题目凌乱不清楚

x+7/16=13/18 x =13/18-7/16 x =208/288-126/288 x =82/288=41/144

解:13x/18=35 解得:x=48又6/13

(1)7x-2×9=81, 7x-18=81, 7x-18+18=81+18, 7x÷7=99÷7, x=14 1 7 ;(2)7+5x=42, 7+5x-7=42-7, 5x÷5=35÷5, x=7;(3)13x-7.5x=19.25, 5.5x=19.25, 5.5x÷5.5=19.25÷5.5, x=3.5;(4)(32-x)×6=108, (32-x)×6÷6=108÷6, 32-x=1...

A中集合中含有元素3,但不满足条件.B.中当k=-1时,x=-3,不满足条件.C.中当t=0时,x=-3,不满足条件.故选:D.

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