利用因式分解计算(要写过程)99*101*1000149(a-b)^2-16(a+b)^22x^2-1/2y^2

问题描述:

利用因式分解计算(要写过程)
99*101*10001
49(a-b)^2-16(a+b)^2
2x^2-1/2y^2

99*101*1001=(100-1)*(100+1)*10001=(100^2-1^2)*10001=9999*10001=(10000-1)*(10000+1)=10000^2-1^2=99999999
49(a-b)^2-16(a+b)^2 ={7(a-b)}^2-{4(a+b)}^2=(7a-7b+4a+4b)(7a-7b-4a-4b)=(11a-3b)(3a-11b)
2x^2-1/2y^2=1/2{(2x)^2-y^2}=1/2(2x+y)(2x-y)

99*101*10001 =(100-1)(100+1)*10001 =(100^2-1)*10001=(100^2-1)(100^2+1) =100^4-1 =9999999949(a-b)^2-16(a+b)^2 =[7(a-b)+4(a+b)][7(a-b)-4(a+b)] =(11a-3b)(3a-11b)2x^2-1/2y^2=2(x^2-1/4y^2 ) =2(x+1/2y)(x-1/...