1.（-xy²）×(28x^4y²z）÷（7^3y)2.[(x+y)²-y（2x+y)-8x]÷(2x)3.[(-x^3]²×（-x²)^34.-2^-3÷4^-2×2^-45.(x+5)²-(x-5)²-5(2x-1)(2x+1)+x(2x)²6.(x+2y)(x-2y)-(2x-y)(2x+y)

Question

1.（-xy²）×(28x^4y²z）÷（7^3y)
2.[(x+y)²-y（2x+y)-8x]÷(2x)
3.[(-x^3]²×（-x²)^3
4.-2^-3÷4^-2×2^-4
5.(x+5)²-(x-5)²-5(2x-1)(2x+1)+x(2x)²
6.(x+2y)(x-2y)-(2x-y)(2x+y)

Answer 1

1.（-xy²）×(28x^4y²z）÷（7^3y)
=（-28x^5 y^4z）÷（343y)
=-4/49x^5 y^3z
2.[(x+y)²-y（2x+y)-8x]÷(2x)
=(x²+y²+2xy-2xy-y²-8x)÷(2x)
=(x²-8x) ÷(2x)
=x/2-4
3.[(-x^3]² ×（-x²)^3
=x^6×(-x^6)
=-x^12
4.-2^-3÷4^-2×2^-4
=-(1/2)^3÷(1/4)^2×(1/2)^4
=(-1/8)÷(1/16)×(1/16)
=-1/8
5.(x+5)²-(x-5)²-5(2x-1)(2x+1)+x(2x)²
=(x²+25+10x)-(x²+25-10x)-5(4x²-1)+4x^3
=4x^3-20x²+20x+5
6.(x+2y)(x-2y)-(2x-y)(2x+y)
=x²-4y²-4x²+y²
=-3x²-3y²