1个回答
2017-12-31
展开全部
2x(3²-4x+1)-3x²(2x-3)-1
=18x-8x²+2x-6x³+9x²-1
=-6x³+x²+18x-1
=-6×(-5)³+(-5)²+18×(-5)-1
=750+25-90-1
=684
=18x-8x²+2x-6x³+9x²-1
=-6x³+x²+18x-1
=-6×(-5)³+(-5)²+18×(-5)-1
=750+25-90-1
=684
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