3(2a²-a-1)-2(1-5a+2a²)等于多少
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3(2a²-a-1)-2(1-5a+2a²)等于多少
3(2a²-a-1)-2(1-5a+2a²)等于多少
3(2a²-a-1)-2(1-5a+2a²)等于多少
3(2a²-a-1)-2(1-5a+2a²)
=6a² -3a -3 -2 +10a -4a²
=2a² +7a -5
2a²+7a-5
3(2a²-a-1)-2(1-5a+2a²)等于多少
3(2a²-a-1)-2(1-5a+2a²)等于多少
3(2a²-a-1)-2(1-5a+2a²)等于多少
3(2a²-a-1)-2(1-5a+2a²)
=6a² -3a -3 -2 +10a -4a²
=2a² +7a -5
2a²+7a-5