①-2a²(二分之一ab+b²)-5a(a²b-ab²)③3x(x²-2x-1)-2x²(x-2
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①-2a²(二分之一ab+b²)-5a(a²b-ab²)③3x(x²-2x-1)-2x²(x-2
①-2a²(二分之一ab+b²)-5a(a²b-ab²)
③3x(x²-2x-1)-2x²(x-2
①-2a²(二分之一ab+b²)-5a(a²b-ab²)③3x(x²-2x-1)-2x²(x-2
原式=a³b-2a²b²-5a³b+5a²b²
=-4a³b+3a²b²
原式=3x³-6x²-3x-2x³+4x²
=x³-2x²-3x
①-2a²(二分之一ab+b²)-5a(a²b-ab²)
=-a³b-2a²b²-5a³b+5a²b²
=-6a³b+3a²b²
③3x(x²-2x-1)-2x²(x-2﹚
=3x³-6x²-3x-2x³+4x²
=x³-2x²-3x