问题:
求值题:
(1)先化简,再求值:(2x-1)(x+2)-2x(x+1),x=
1
3
.
(2)已知:a+b=4,ab=3,求
1
4
a 3b+
1
2
a 2b 2+
1
4
ab 3的值.
求值题:
(1)先化简,再求值:(2x-1)(x+2)-2x(x+1),x=
.
(2)已知:a+b=4,ab=3,求
a 3b+
a 2b 2+
ab 3的值.
(1)先化简,再求值:(2x-1)(x+2)-2x(x+1),x=
1 |
3 |
(2)已知:a+b=4,ab=3,求
1 |
4 |
1 |
2 |
1 |
4 |
参考答案: