
计算(数学)
(1)-(-2a²bc³)³(2)-3x³y·(-2x²y²)²要过程!!(3)(-5x+3/2(二...
(1)-(-2a²bc³)³
(2)-3x³y·(-2x²y²)²
要过程!!
(3)(-5x+3/2(二分之三))(-5x-1.5)
(4)(x+2y-3)(x-2y+3) 展开
(2)-3x³y·(-2x²y²)²
要过程!!
(3)(-5x+3/2(二分之三))(-5x-1.5)
(4)(x+2y-3)(x-2y+3) 展开
3个回答
展开全部
(1)-(-2a²bc³)³=-(-2)³×(a²bc³)³=-(-8)×a^6b³c^9=8a^6b³c^9
(2)-3x³y·(-2x²y²)²=-3x³y·4x^4y^4=-12x^7y^5
(3)(-5x+3/2)(-5x-1.5)=(5x-3/2)(5x+3/2)=25x²-9/4
(4)(x+2y-3)(x-2y+3)=【x+(2y-3)】【x-(2y-3)】=x²-(2y-3)²=x²-4y²+12y-9
(2)-3x³y·(-2x²y²)²=-3x³y·4x^4y^4=-12x^7y^5
(3)(-5x+3/2)(-5x-1.5)=(5x-3/2)(5x+3/2)=25x²-9/4
(4)(x+2y-3)(x-2y+3)=【x+(2y-3)】【x-(2y-3)】=x²-(2y-3)²=x²-4y²+12y-9
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