2m-3n=5 8-2m+3n=多少
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2m-3n=58-2m+3n=多少2m-3n=58-2m+3n=多少2m-3n=58-2m+3n=多少你把8-2m+3n改写成8-(2m-3n)不就行了?3
2m-3n=5 8-2m+3n=多少
2m-3n=5 8-2m+3n=多少
2m-3n=5 8-2m+3n=多少
你把8-2m+3n改写成8-(2m-3n)不就行了?3
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2m-3n=5 8-2m+3n=多少
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