先去括号,再合并同类项,急,🈶好评
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先去括号,再合并同类项,急,🈶好评
先去括号,再合并同类项,急,🈶好评
先去括号,再合并同类项,急,🈶好评
=7a²b-7ab-2a²b+6ab
=5a²b-ab
=7a^2b-7ab-2a^2b+6ab
=(7-2)*a^2b-(7-6)*ab
=5a^2b-ab
=ab(5a-1)
=7a^2b-7ab-2a^2b+6ab
=(7-2)*a^2b-(7-6)*ab
=5a^b-ab