97×7/8×97怎么简便？急！
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=97^2×7/8
=(96+1)^2×7/8
=(96^2+2×96+1)×7/8
=96×96×7/8+2×96×7/8+7/8
=96×12×7+2×12×7+7/8
=12×7×(96+2)+7/8
=84×98+7/8
=84×(100-2)+7/8
=84×100-84×2+7/8
=8400-168+7/8
=8232.875
=(96+1)^2×7/8
=(96^2+2×96+1)×7/8
=96×96×7/8+2×96×7/8+7/8
=96×12×7+2×12×7+7/8
=12×7×(96+2)+7/8
=84×98+7/8
=84×(100-2)+7/8
=84×100-84×2+7/8
=8400-168+7/8
=8232.875
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