a+b=420,a/b=3/7,a=(),b=()
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![a+b=420,a/b=3/7,a=(),b=()](/uploads/image/z/7076670-6-0.jpg?t=a%2Bb%3D420%2Ca%2Fb%3D3%2F7%2Ca%3D%28%29%2Cb%3D%28%29)
a+b=420,a/b=3/7,a=(),b=()
a+b=420,a/b=3/7,a=(),b=()
a+b=420,a/b=3/7,a=(),b=()
按比例分配
3+7=10
a=420×3/10=126
b=420×7/10=294
a/b=3/7
7a=3b
3a+3b=1260
3a+7a=1260
a=126
7*126=3b
b=294
a=126.b=294