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一天要做一本作业所以~全部解答者加150分~1.(3x²y)²×(-15xy³)÷(-9x^4y²)2.a²(a+1)²-2(a²-2a+4)3.3x²+(-3/2x+1/3y²)(2x-2/3y)4.(8x^n+1-3x^n-1)-2(-x+9x^n+1-4x^n)5.(

题目详情
一天要做一本作业所以~全部解答者加150分~
1.(3x²y)²×(-15xy³)÷(-9x^4y²)
2.a²(a+1)²-2(a²-2a+4)
3.3x²+(-3/2x+1/3y²)(2x-2/3y)
4.(8x^n+1-3x^n-1)-2(-x+9x^n+1-4x^n)
5.(-2/3ax³)²+3ax^4(1-1/3ax²)
6.(2/3x^ay^b)²×(-9/5x^3a y)×(-xyz)
7.(5×10^5)³÷(2.5×10³)×(-4×10^-7)²
9.[(3x-2y)²-(3x+2y)(3x-2y)]÷(2y-3x)
10.(x^n-1)²×(x²)^2-n×(-x^n)
11.(2x+y-z)²
12.(1/2x^4 y²-1/3x³y³-3/4x²y^4)÷(-2/3x²y²)
13.-(-xy)²(x²-xy-y²)+(x²y)²
14.(2x-y)(2x+y)(4x²-y²)
▼优质解答
答案和解析
1(3x²y)²×(-15xy³)÷(-9x^4y²)= (9x^4y^2)(-15xy^2)/(-9x4y^2)=15xy^2
2.a²(a+1)²-2(a²-2a+4)=a^2(a^2+2a+1)-(2a^2-4a+8)=a^4+2a^3+a^2-2a^2+4a-8=a^4+2a^3-a^2+4a-8
3.3x²+(-3/2x+1/3y²)(2x-2/3y)=3x^2-3+2x/3y^2+1/xy-2/9y^3
4.(8x^n+1-3x^n-1)-2(-x+9x^n+1-4x^n)=8x^n+1-3x^n-1-2x-18x^n-2+8x^n=-5x^n-2x-2
5.(-2/3ax³)²+3ax^4(1-1/3ax²)=4/9a^2x^6+3aX^4-x^2
6.(2/3x^ay^b)²×(-9/5x^3a y)×(-xyz)=4/9*x^2ay^2b*9/5x^4ay^2z=4/5x^6ay^2z
7.(5×10^5)³÷(2.5×10³)×(-4×10^-7)²=2*10^12*1089=2178*10^12
9.[(3x-2y)²-(3x+2y)(3x-2y)]÷(2y-3x)=-(3x-2y)+3x+2y=4y
10.(x^n-1)²×(x²)^2-n×(-x^n)=(x^2n-2x^n+1)*x^4+nx^n
11.(2x+y-z)²
12.(1/2x^4 y²-1/3x³y³-3/4x²y^4)÷(-2/3x²y²)
13.-(-xy)²(x²-xy-y²)+(x²y)²
14.(2x-y)(2x+y)(4x²-y²)