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数学
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解方程组:3a:5b=8:5,4a+2b=38
人气:237 ℃ 时间:2020-01-28 00:49:22
解答
解方程组:
3a:5b=8:5
4a+2b=38
15a=40b
3a=8b
2a+b=19
b=19-2a
3a=8(19-2a)
3a=152-16a
19a=152
a=8
b=3
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