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数学练习
式与证明
恒等式
练习1
式与证明
恒等式
1 / 5
标准
求使下列等式成为关于 x 的恒等式的常数。
a
(
x
+
2
)
+
b
(
x
−
3
)
=
5
x
a\left(x + 2\right) + b\left(x - 3\right) = 5x
a
(
x
+
2
)
+
b
(
x
−
3
)
=
5
x
1
a
=
3
,
b
=
2
a = 3,\ b = 2
a
=
3
,
b
=
2
2
a
=
2
,
b
=
3
a = 2,\ b = 3
a
=
2
,
b
=
3
3
a
=
3
,
b
=
−
2
a = 3,\ b = -2
a
=
3
,
b
=
−
2
4
a
=
−
3
,
b
=
2
a = -3,\ b = 2
a
=
−
3
,
b
=
2
作答
