5mn-(5mn+(2m的2次方n+(m的2次方n-3mn))-2m的2次方n)要求写原式=去括号=结果=结果

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5mn-(5mn+(2m的2次方n+(m的2次方n-3mn))-2m的2次方n)要求写原式=去括号=结果=结果
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5mn-(5mn+(2m的2次方n+(m的2次方n-3mn))-2m的2次方n)要求写原式=去括号=结果=结果
5mn-(5mn+(2m的2次方n+(m的2次方n-3mn))-2m的2次方n)
要求写原式=去括号=结果=结果

5mn-(5mn+(2m的2次方n+(m的2次方n-3mn))-2m的2次方n)要求写原式=去括号=结果=结果
5mn-{5mn+[2m的2次方n+(m的2次方n-3mn)]-2m的2次方n}
=5mn-{5mn+[2m^2n+m^2n-3mn]-2m^2n}
=5mn-{5mn+[3m^2n-3mn]-2m^2n}
=5mn-{5mn+3m^2n-3mn-2m^2n}
=5mn-{2mn+m^2n}
=5mn-2mn-m^2n
=3mn-m^2n

5mn-(5mn+(2m的2次方n+(m的2次方n-3mn))-2m的2次方n)
=5mn-{5mn+[2m²n+(m²n-3mn)]-2m²n}
=5mn-[5mn+(2m²n+m²n-3mn)-2m²n]
=5mn-(5mn+3m²n-3mn-2m²n)
=5mn-5mn+m²n-3mn
=m²n-3mn
=mn(m-3)