ab+a-2ab-3a-b 3a2+5a-4a2-6a+2a2-3 (第2题如:3a2 3a后面这个2是指a的平方 4a2,2a2也是一样10x2y-7xy2+4xy-9yx2-2xy (后缀的2的意思 如第2题括号内)2xy2z-4xyz-3xzy2+2xyz
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/02 23:48:15
![ab+a-2ab-3a-b 3a2+5a-4a2-6a+2a2-3 (第2题如:3a2 3a后面这个2是指a的平方 4a2,2a2也是一样10x2y-7xy2+4xy-9yx2-2xy (后缀的2的意思 如第2题括号内)2xy2z-4xyz-3xzy2+2xyz](/uploads/image/z/10200230-62-0.jpg?t=ab%2Ba-2ab-3a-b+3a2%2B5a-4a2-6a%2B2a2-3++%28%E7%AC%AC2%E9%A2%98%E5%A6%82%EF%BC%9A3a2+3a%E5%90%8E%E9%9D%A2%E8%BF%99%E4%B8%AA2%E6%98%AF%E6%8C%87a%E7%9A%84%E5%B9%B3%E6%96%B9+4a2%2C2a2%E4%B9%9F%E6%98%AF%E4%B8%80%E6%A0%B710x2y-7xy2%2B4xy-9yx2-2xy+++%28%E5%90%8E%E7%BC%80%E7%9A%842%E7%9A%84%E6%84%8F%E6%80%9D+%E5%A6%82%E7%AC%AC2%E9%A2%98%E6%8B%AC%E5%8F%B7%E5%86%85%EF%BC%892xy2z-4xyz-3xzy2%2B2xyz)
ab+a-2ab-3a-b 3a2+5a-4a2-6a+2a2-3 (第2题如:3a2 3a后面这个2是指a的平方 4a2,2a2也是一样10x2y-7xy2+4xy-9yx2-2xy (后缀的2的意思 如第2题括号内)2xy2z-4xyz-3xzy2+2xyz
ab+a-2ab-3a-b
3a2+5a-4a2-6a+2a2-3 (第2题如:3a2 3a后面这个2是指a的平方 4a2,2a2也是一样
10x2y-7xy2+4xy-9yx2-2xy (后缀的2的意思 如第2题括号内)
2xy2z-4xyz-3xzy2+2xyz
ab+a-2ab-3a-b 3a2+5a-4a2-6a+2a2-3 (第2题如:3a2 3a后面这个2是指a的平方 4a2,2a2也是一样10x2y-7xy2+4xy-9yx2-2xy (后缀的2的意思 如第2题括号内)2xy2z-4xyz-3xzy2+2xyz
原式=(ab-2ab)+(a-3a)-b=-ab-2a-b
原式=(3a²-4a²+2a²)+(5a-6a)-3=a²-a-3
原式=(10x²y-9x²y)+(4xy-2xy)-7xy²=x²y+2xy-7xy²
ab+a-2ab-3a-b=-ab-2a-b
3a^2+5a-4a^2-6a+2a^2-3=a^2-a-3
10x^2y-7xy^2+4xy-9yx^2-2xy=yx^2+2xy-7xy^2
2xy^2z-4xyz-3xzy^2+2xyz=-xzy^2-2xyz
ab+a-2ab-3a-b =ab-2ab+a-3a-b =(ab-2ab)+(a-3a)-b=ab(1-2)+a(1-3)+b=ab-2a-b
3a²+5a-4a²-6a+2a²-3 =3a²-4a²+2a²+5a-6a--3=(3a²-4a²+2a²)+(5a-6a)-3=a²-a-3<...
全部展开
ab+a-2ab-3a-b =ab-2ab+a-3a-b =(ab-2ab)+(a-3a)-b=ab(1-2)+a(1-3)+b=ab-2a-b
3a²+5a-4a²-6a+2a²-3 =3a²-4a²+2a²+5a-6a--3=(3a²-4a²+2a²)+(5a-6a)-3=a²-a-3
10x²y-7xy²+4xy-9yx²-2xy=10x²y-9x²y-7xy²+4xy-2xy=(10x²y-9x²y)-7xy²+(4xy-2xy)=x²y-7xy²+2xy
2xy²z-4xyz-3xzy²+2xyz=(2xy²z-3xzy²)+(2xyz-4xyz)=-xy²z-2xyz
收起