已知,4m+n=90,2m-3n=10,求(m+2n)²-(3m-n)²的值.
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已知,4m+n=90,2m-3n=10,求(m+2n)²-(3m-n)²的值.已知,4m+n=90,2m-3n=10,求(m+2n)²-(3m-n)²的值.已知
已知,4m+n=90,2m-3n=10,求(m+2n)²-(3m-n)²的值.
已知,4m+n=90,2m-3n=10,求(m+2n)²-(3m-n)²的值.
已知,4m+n=90,2m-3n=10,求(m+2n)²-(3m-n)²的值.
4m+n=90① 2m-3n=10② ①+② m+2n=40③
②+③ 3m-n=50
已知,4m+n=90,2m-3n=10,求(m+2n)²-(3m-n)²的值
已知,4m+n=90,2m-3n=10,求(m+2n)²-(3m-n)²的值.
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