Question

3/5X-1/4X=7 8/11:10=4/5：X 3X-16×5=13 X：2/3=0.25:0.2

Answer 1

①2.5×8=5×x﹙题目应该是2.5∶5=x∶8吧﹚

x=4

②2x=21.7－3×0.9=19

x=9.5

③5x=0.5＋4.5×2=10

x=2

④X：2/5=1/2:3/10

3／10x=2／5×1／2=1／5

x=1／5×3／10

x=2／3

⑤ 1/2（4X-8)=4

等价于2x-4=4

x=4

⑥ X:2.5=1.2:7.5

7.5x=2.5×1.2

x=3÷7.5

x=0.4

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