高校问答万道剑尊 最新章节三掌:初一数学计算题
来源：百度文库 编辑：高校问答 时间：2024/05/05 09:38:13
1.(2a-b)(b-2a)
2.(a+2b+1)^2 (x-y+3)^2
1.(2a-b)(b-2a)
2.(a+2b+1)^2
3.(x-y+3)^2
2.(a+2b+1)^2 (x-y+3)^2
1.(2a-b)(b-2a)
2.(a+2b+1)^2
3.(x-y+3)^2
1.(2a-b)(b-2a)=(2a-b)*b-(2a-b)*2a=2ab-b^2-(4a^2-2ab)=2ab-b^2-4a^2+2ab=4ab-b^2-4a^2
2.(a+2b+1)^2 (x-y+3)^2=(a+2b+1)*(a+2b+1)*(x-y+3)*(x-y+3)=(a^2+2ab+a+2ab+4b^2+2b+a+2b+1)*(x^2-xy+3x-xy+y^2+3y+3x-3y+9)=(a^2+4ab+2a+4b^2+4b+1)*(x^2-2xy+6x-xy+y^2+9)
4ab-b^2-4a^2
(a^2+4ab+2a+4b^2+4b+1)*(x^2-2xy+6x-xy+y^2+9)
1.(2a-b)(b-2a)=(2a-b)*b-(2a-b)*2a=2ab-b^2-(4a^2-2ab)=2ab-b^2-4a^2+2ab=4ab-b^2-4a^2
2.(a+2b+1)^2 (x-y+3)^2=(a+2b+1)*(a+2b+1)*(x-y+3)*(x-y+3)=(a^2+2ab+a+2ab+4b^2+2b+a+2b+1)*(x^2-xy+3x-xy+y^2+3y+3x-3y+9)=(a^2+4ab+2a+4b^2+4b+1)*(x^2-2xy+6x-xy+y^2+9)
很简单啊!!