m-{n+[4m-3(m+2n)]}-5n其中m=2/3 n=-4

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m-{n+[4m-3(m+2n)]}-5n其中m=2/3 n=-4
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m-{n+[4m-3(m+2n)]}-5n其中m=2/3 n=-4
m-{n+[4m-3(m+2n)]}-5n其中m=2/3 n=-4

m-{n+[4m-3(m+2n)]}-5n其中m=2/3 n=-4
m-{n+[4m-3(m+2n)]}-5n
=m-{n+[4m-3m-6n]}-5n
=m-{n+[m-6n]}-5n
=m-{n+m-6n}-5n
=m+5n-m-5n
=0

m-{n+[4m-3(m+2n)]}-5n
=m-{n+4m-3m-6n}-5n
=m-[m-5n]-5n
=0

m-{n+[4m-3(m+2n)]}-5n
=m-{n+[m-6n]}-5n
=m-(m-5n)-5n
=0

等于0

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