已知:x:2又1⼀7=1又3⼀4 求x? 2.解方程:x:(x-3)=7:5

2025-06-22 08:54:43
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回答1:

x:2又1/7=1又3/4
x=7/4*15/7
x=15/4
x:(x-3)=7:5
7(x-3)=5x
7x-21=5x
7x-5x=21
2x=21
x=21/2