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数学
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x:5/7=42:3/5 是多少?
人气：188 ℃ 时间：2020-04-14 21:01:01
解答
x:5/7=42:3/5x=42x5/7 ,3/5x=30 ,x=50
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42比3/5=x比5/7简便计算
（X+7）（X+5）-（X+1）（X+5）=42
（X+7）（X-5）-(X+5)=42
X+7=42-X-5
(1+40%)x=7 1-25%x=3/5 40%x+x/8=42 求解 要正确答案!
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