(1)因式分解:2a(x-y)-3b(y-x)(2)因式分解:-2a3+12a2-18a(3)解方程:1?xx?2=12?x-2(4)化简
(1)因式分解:2a(x-y)-3b(y-x)(2)因式分解:-2a3+12a2-18a(3)解方程:1?xx?2=12?x-2(4)化简:ba?b+b3a3?2a2b+...
(1)因式分解:2a(x-y)-3b(y-x)(2)因式分解:-2a3+12a2-18a(3)解方程:1?xx?2=12?x-2(4)化简:ba?b+b3a3?2a2b+ab2÷ab+b2b2?a2.
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(1)原式=2a(x-y)+3b(x-y)
=(x-y)(2a+3b);
(2)原式=-2a(a2-6a+9)
=-2a(a-3)2;
(3)方程两边同乘(x-2)得,1-x=-1-2(x-2),
去括号得:1-x=-1-2x+4,
移项合并得:x=2,
检验,当x=2时,x-2=0,
∴x=2不是原方程的根,
则原分式方程无解;
(4)原式=
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÷
=
-
?
=
-
=
=
=
.
=(x-y)(2a+3b);
(2)原式=-2a(a2-6a+9)
=-2a(a-3)2;
(3)方程两边同乘(x-2)得,1-x=-1-2(x-2),
去括号得:1-x=-1-2x+4,
移项合并得:x=2,
检验,当x=2时,x-2=0,
∴x=2不是原方程的根,
则原分式方程无解;
(4)原式=
b |
a?b |
b3 |
a(a?b)2 |
b(a+b) |
(a+b)(a?b) |
=
b |
a?b |
b3 |
a(a?b)2 |
(a?b)(a+b) |
b(a+b) |
=
b |
a?b |
b2 |
a(a?b) |
=
ab?b2 |
a(a?b) |
=
b(a?b) |
a(a?b) |
=
b |
a |
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