用因式分解法解2m(m+2)=m+2,4(y-3)^2-2(y-3)=0,x^2-10x-75=0,x^2-x-6=0
问题描述:
用因式分解法解2m(m+2)=m+2,4(y-3)^2-2(y-3)=0,x^2-10x-75=0,x^2-x-6=0
答
2m(m+2)=m+22m(m+2)-(m+2)=0(2m-1)(m+2)=0所以2m-1=0 m=1/2或者m+2=0 m=﹣24(y-3)^2-2(y-3)=02(y-3)[2(y-3)-1]=02(y-3)(2y-7)=0所以y-3=0 y=3或者2y-7=0 y=7/2x^2-10x-75=0(x-15)(x+5)=0所以x-15=...