(a+2b)²+______=a²+2ab+4b²若x²+2x=1,则(x+1)²=
来源:学生作业帮助网 编辑:六六作业网 时间:2024/12/23 22:22:31
(a+2b)²+______=a²+2ab+4b²若x²+2x=1,则(x+1)²=(a+2b)²+______=a²+2ab+4
(a+2b)²+______=a²+2ab+4b²若x²+2x=1,则(x+1)²=
(a+2b)²+______=a²+2ab+4b²
若x²+2x=1,则(x+1)²=
(a+2b)²+______=a²+2ab+4b²若x²+2x=1,则(x+1)²=
(a+2b)²+_(-2ab)_____=a²+2ab+4b²
(x+1)^2
=x^2+2x+1
∵x^2+2x=1
∴(x+1)^2=1+1=2
若x²+2x=1,则(x+1)²=(2)
(a+2b)²=a²+4b²+4ab
所以(a+2b)²+(-2ab)=a²+2ab+4b²
(x+1)²=x²+2x+1=1+1=2