初二数学—整式的乘法知识点归纳及练习.

1naanananan23aman=am+n4am+n=aman51aman=am-na02am-n=amana01pp0123561m(a+b+c)=ma+mb+mc2341(m+n)(a+b)=ma+mb+na+nb23451(x+a)(x+b)=x2+(a+b)x+ab1a+b(a-b)=a2-b22ab3a2-b2=a+b(a-b)4a+b(a-b)a2b21(ab)2=a22ab+b222ab1211231333mmA1B1C0D13mC41mm88122252m(51)1-2m118m2215n1125434xyxy220042003241131716xy260102222323225xyxyzxyz=74552420xyzxyz472ba42ba22baab11232511abab2221aabb