来自拱长青的问题
①3a(x-y)+9(y-x)②16mn^4-m③(x-y)³+9(x-y)+6(x-y)²④(x+2)(x+4)+2x²-5
①3a(x-y)+9(y-x)
②16mn^4-m
③(x-y)³+9(x-y)+6(x-y)²
④(x+2)(x+4)+2x²-5
1回答
2020-03-19 10:33
①3a(x-y)+9(y-x)②16mn^4-m③(x-y)³+9(x-y)+6(x-y)²④(x+2)(x+4)+2x²-5
①3a(x-y)+9(y-x)
②16mn^4-m
③(x-y)³+9(x-y)+6(x-y)²
④(x+2)(x+4)+2x²-5
1.3a(x-y)+9(y-x)=3a(x-y)-9(x-y)=3(x-y)(a-3)2.16mn⁴-m=m(16n⁴-1)=m(4n²+1)(4n²-1)=m(4n²+1)(2n+1)(2n-1)3.(x-y)³+9(x-y)+6(x-y)²=(x-y)[(x-y)²+6(x-y)+9]...