丨a-2丨+(6+1)²=0,
a-2=0;
a=2;
b+1=0;
b=-1;
求5ab²-[2a²b-(4ab²-2a²b)]
=5ab²-2a²b+4ab²-2a²b
=9ab²-4a²b
=9×2×1-4×4×(-1)
=18+16
=34;
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丨a-2丨+(6+1)²=0,
a-2=0;
a=2;
b+1=0;
b=-1;
求5ab²-[2a²b-(4ab²-2a²b)]
=5ab²-2a²b+4ab²-2a²b
=9ab²-4a²b
=9×2×1-4×4×(-1)
=18+16
=34;
很高兴为您解答,skyhunter002为您答疑解惑
如果本题有什么不明白可以追问,