4a的2次方+2b的2次方-6a+3b+16a的2 - 知识问答

4a的2次方+2b的2次方-6a+3b+16a的2次方+8b-12a+6b

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解
不好意思刚刚那道题我化错了
4a²+2b²-6a+3b+16a²+8b-12a+6b
=(4a²+16a²)+2b²+(-6a-12a)+(3b+8b+6b)
=20a²+2b²-18a+17b
=20×4+2×(1/25)-18×(-2)+17×(1/5)
=80+2/25+36+17/5
=116+(2/25+85/25)
=116+87/5
=667/25

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