16(a+b)²-9(a-b)²
=[4(a+b)+3(a-b)][4(a+b)-3(a-b)]
=(4a+4b+3a-3b)(4a+4b-3a+3b)
=(7a+b)(a+7b)9(x-3)²-4(2-3x)²-4(x-y)²+16z²9(x-3)²-4(2-3x)² =[3(x-3)+2(2-3x)][3(x-3)-2(2-3x)]=(3x-9+4-6x)(3x-9-4+6x)=(-3x-5)(9x-13)=-(3x+5)(9x-13) -4(x-y)²+16z²=[4z-2(x-y)][4z+2(x-y)]=(4z-2x+2y)(4z+2x-2y)=4(2z-x+y)(2z+x-y)再麻烦一下,我真心做不来。169x²-196y²(2x+y)²-(x+2y)²169x²-196y²=(13x+14y)(13x-14y) (2x+y)²-(x+2y)²=(2x+y+x+2y)(2x+y-x-2y)=(3x+3y)(x-y)=3(x+y)(x-y)
猜你喜欢
- 1纺织厂女工人数比全厂人数的75%还多100人,男工人数是女工人数的1/5,这个纺织厂有男工多少人?
- 2把一根长1.5米的圆柱形木料锯成三个小圆柱,表面积增加了8平方分米,原来这根木料的体积是_立方分米.
- 3999乘111加333乘667等于多少?
- 4观察正切曲线,写出满足下列条件的x的范围
- 5bill is()athletic then peter A.much B.much more C.little D.little more 括号中应填什么 为什么
- 6已知A、B、C、D、E、F六种物质间有下列转化关系:(1)A+B→C+H2O (2)C+KOH→D↓(蓝色)+E 详见补充
- 7小宇“探究摩擦力大小与什么因素有关”
- 8连词成句:did,have,any,your,english,you,difficuties,in.
- 9小强计算一个数除以2.4时,粗心地算成一个数乘2.4,得到的结果是144.这道除法题的正确结果( )
- 10翻译:You are never too later to sleep than to stay up.