|m|=3,|n|=7,则|m+n|等于
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![|m|=3,|n|=7,则|m+n|等于](/uploads/image/z/2640367-55-7.jpg?t=%7Cm%7C%3D3%2C%7Cn%7C%3D7%2C%E5%88%99%7Cm%2Bn%7C%E7%AD%89%E4%BA%8E)
|m|=3,|n|=7,则|m+n|等于
|m|=3,|n|=7,则|m+n|等于
|m|=3,|n|=7,则|m+n|等于
m/2+n/3=7 ----------(1)
m/3-n/4=-7 ----------(2)
(1)式*6得
3m+2n=42----------(3)
(2)式*12得
4m-3n=-84---------(4)
(3)式*3+(4)式*2得
17m=-42
m=-42/17
n=24又12/17