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1.345*0.345*2.69-1.345^3-1.345^3*0.345^2help!
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1.345*0.345*2.69-1.345^3-1.345^3*0.345^2
help!
help!
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答案和解析
1.345×0.345×2.69-1.345³-1.345×0.345²
=1.345×(0.345×2.69-1.345²-0.345²)
=1.345×(-1)×(1.345²-2×0.345×1.345+0.345²)
=-1.345×(1.345-0.345)²
=-1.345×1²
=-1.345
=1.345×(0.345×2.69-1.345²-0.345²)
=1.345×(-1)×(1.345²-2×0.345×1.345+0.345²)
=-1.345×(1.345-0.345)²
=-1.345×1²
=-1.345
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