计算:(1)(3x-5)²;(2)(-4a+1/2b)².
来源:学生作业帮助网 编辑:作业帮 时间:2024/11/16 13:32:43
x){nuӭ455+tM5Ք
-545tM
bz6IE$/!B,`u@-SmSdPic
m#S1FPZfJX( e
yvPـ98An([T$ IVn O'rt
计算:(1)(3x-5)²;(2)(-4a+1/2b)².
计算:(1)(3x-5)²;(2)(-4a+1/2b)².
计算:(1)(3x-5)²;(2)(-4a+1/2b)².
(1)
(3x-5)²
=(3x)²-2*(3x)*5+5²
=9x²-30x+25
(2)
(-4a+1/2b)².
=(1/2b-4a)²
=b²/4 -4ab+16a²
计算:(1)(3x-5)²;
=9x²-30x+25
(2)(-4a+1/2b)²
=16a²-4ab+1/4b²
.