作业帮计算下列各题(2x-y)(2x+y)+(y-x)(2x-5y)(3×10^-3)^4×(-2×10^2)^3[(x^2-4)/(x^2-x-6)+(x+2)/(x-3)]÷(x+1)/(x-3)(-a^-2/b)^-2(-b^2/a)÷(1/ab)^-4
来源：学生作业帮助网 编辑：作业帮 时间：2024/05/08 04:00:57
![计算下列各题(2x-y)(2x+y)+(y-x)(2x-5y)(3×10^-3)^4×(-2×10^2)^3[(x^2-4)/(x^2-x-6)+(x+2)/(x-3)]÷(x+1)/(x-3)(-a^-2/b)^-2(-b^2/a)÷(1/ab)^-4](/uploads/image/z/10247092-52-2.jpg?t=%E8%AE%A1%E7%AE%97%E4%B8%8B%E5%88%97%E5%90%84%E9%A2%98%282x-y%29%282x%2By%29%2B%28y-x%29%282x-5y%29%283%C3%9710%5E-3%29%5E4%C3%97%28-2%C3%9710%5E2%29%5E3%5B%28x%5E2-4%29%2F%28x%5E2-x-6%29%2B%28x%2B2%29%2F%28x-3%29%5D%C3%B7%28x%2B1%29%2F%28x-3%29%28-a%5E-2%2Fb%29%5E-2%28-b%5E2%2Fa%29%C3%B7%281%2Fab%29%5E-4)
计算下列各题(2x-y)(2x+y)+(y-x)(2x-5y)(3×10^-3)^4×(-2×10^2)^3[(x^2-4)/(x^2-x-6)+(x+2)/(x-3)]÷(x+1)/(x-3)(-a^-2/b)^-2(-b^2/a)÷(1/ab)^-4
计算下列各题
(2x-y)(2x+y)+(y-x)(2x-5y)
(3×10^-3)^4×(-2×10^2)^3
[(x^2-4)/(x^2-x-6)+(x+2)/(x-3)]÷(x+1)/(x-3)
(-a^-2/b)^-2(-b^2/a)÷(1/ab)^-4
计算下列各题(2x-y)(2x+y)+(y-x)(2x-5y)(3×10^-3)^4×(-2×10^2)^3[(x^2-4)/(x^2-x-6)+(x+2)/(x-3)]÷(x+1)/(x-3)(-a^-2/b)^-2(-b^2/a)÷(1/ab)^-4
(2x-y)(2x+y)+(y-x)(2x-5y)
=4x²-y²+2xy-5y²-2x²+5xy
=2x²+7xy-6y²
(3×10^-3)^4×(-2×10^2)^3
=81×10^-12 ×(-8×10^6)
=-648×10^(-6)
=-6.48×10^(-4)
[(x^2-4)/(x^2-x-6)+(x+2)/(x-3)]÷(x+1)/(x-3)
=[(x+2)(x-2)/(x-3)(x+2) +(x+2)/(x-3)] ×(x-3)/(x+1)
=[(x-2)/(x-3)+(x+2)/(x-3)] ×(x-3)/(x+1)
=2x/(x-3) ×(x-3)/(x+1)
=2x/(x+1)
(-a^-2/b)^-2(-b^2/a)÷(1/ab)^-4
=b²/a^4 ×(-b²/a)×1/a^4b^4
=-1/a^9
1.2x^2-6y^2-3xy