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1.(3x+9)(6x+8)2.(1\2x²y-2xy+y²)*3xy3.(1\3a²b³)*(-15a²b²...
1. (3x+9)(6x+8)
2. (1\2x²y-2xy+y²)* 3xy
3.(1 \3a²b³)*(-15a²b²)
4.(3mn+1)(3mn-1)-8m²n²
5.(x+2)² - (x+1)(x-1)
6.(-2m-1)(3m-2)
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2. (1\2x²y-2xy+y²)* 3xy
3.(1 \3a²b³)*(-15a²b²)
4.(3mn+1)(3mn-1)-8m²n²
5.(x+2)² - (x+1)(x-1)
6.(-2m-1)(3m-2)
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1个回答
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1. (3x+9)(6x+8)
=18x²+54x+24x+72
=18x²+78x+72
2. (1\2x²y-2xy+y²)* 3xy
=3/2x³y²-6x²y²+3xy³
3.(1 \3a²b³)*(-15a²b²)
=-5a^4*b^5
4.(3mn+1)(3mn-1)-8m²n²
=9m²n²-1-8m²n²
=m²n²-1
=(mn+1)(mn-1)
5.(x+2)² - (x+1)(x-1)
=x²+4x+4-x²+1
=4x+5
6.(-2m-1)(3m-2)
=-6m²+4m-3m+2
=-6m²+m+2
=18x²+54x+24x+72
=18x²+78x+72
2. (1\2x²y-2xy+y²)* 3xy
=3/2x³y²-6x²y²+3xy³
3.(1 \3a²b³)*(-15a²b²)
=-5a^4*b^5
4.(3mn+1)(3mn-1)-8m²n²
=9m²n²-1-8m²n²
=m²n²-1
=(mn+1)(mn-1)
5.(x+2)² - (x+1)(x-1)
=x²+4x+4-x²+1
=4x+5
6.(-2m-1)(3m-2)
=-6m²+4m-3m+2
=-6m²+m+2
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