会一道答一道吧最好的就是完全答对1.(6/5a³x^4-0.9ax³)÷3/5ax³(7x²y³-8x³y²z)÷8x²y²12^13÷(3^10×4^11)(5^4×3³-5³×3²+5²×3)÷152.分解因式25x²-16y²(a-b)(x-y)
会一道答一道吧最好的就是完全答对
1.(6/5a³x^4-0.9ax³)÷3/5ax³
(7x²y³-8x³y²z)÷8x²y²
12^13÷(3^10×4^11)
(5^4×3³-5³×3²+5²×3)÷15
2.分解因式
25x²-16y²
(a-b)(x-y)-(b-a)(x+y)
a²-4ab+4b²
4+12(x-y)+9(x+y)²
3.计算
4(x+1)²-(2x+5)(2x-5)
2x·(1/2x²-1)-3x(1/3x²+2/3)
3(y-z)²-(2y+z)(-z+2y)
[x(x²y²-xy)-y(x²-x³y)]÷3x²y
4.分解因式
x³-9x
16x^4-1
6xy²-9x²y-y³
(2a-b)²+8ab
5.已知(x+y)²=25,(x-y)²=9,求xy与x²+y²的值.
6.解方程(x+7)(x+5)-(x+1)(x+5)=42