1.计算:(-3x²)(-2xy+3xy²-x+1)(写过程)
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1.计算:(-3x²)(-2xy+3xy²-x+1)(写过程)
2.若﹣x²y=2 则﹣xy(x的5次方y²-x³y+2x)的值为 A16 B0 C 8 D12
3(﹣2a)(¼a³-1)=
4.a(b+c)-ab=
2.若﹣x²y=2 则﹣xy(x的5次方y²-x³y+2x)的值为 A16 B0 C 8 D12
3(﹣2a)(¼a³-1)=
4.a(b+c)-ab=
1.计算:(-3x²)(-2xy+3xy²-x+1)(写过程)
(-3x²) (-2xy+3xy²-x+1)
=(-3x²)(-2xy)+(-3x²)×3xy²-(-3x²)×x+(-3x²)×1
=6x³y-9x³y²+3x³-3x²
2.若﹣x²y=2 则﹣xy(x的5次方y²-x³y+2x)的值为 A16 B0 C 8 D12
﹣x²y=2
∴x²y=-2
﹣xy(x的5次方y²-x³y+2x)
=-x²y(x的4次方y²-x²y+2)
=2(4+2+2)
=16
选A
3(﹣2a)(¼a³-1)
=-1/2a的4次方+2a
4.a(b+c)-ab
=ab+ac-ab
=ac
(-3x²) (-2xy+3xy²-x+1)
=(-3x²)(-2xy)+(-3x²)×3xy²-(-3x²)×x+(-3x²)×1
=6x³y-9x³y²+3x³-3x²
2.若﹣x²y=2 则﹣xy(x的5次方y²-x³y+2x)的值为 A16 B0 C 8 D12
﹣x²y=2
∴x²y=-2
﹣xy(x的5次方y²-x³y+2x)
=-x²y(x的4次方y²-x²y+2)
=2(4+2+2)
=16
选A
3(﹣2a)(¼a³-1)
=-1/2a的4次方+2a
4.a(b+c)-ab
=ab+ac-ab
=ac
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