已知a+b-c=0,2a-b+2c=o(c≠0)求3a-2b+5/5a-3b+2c的值?-4/11
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![已知a+b-c=0,2a-b+2c=o(c≠0)求3a-2b+5/5a-3b+2c的值?-4/11](/uploads/image/z/1798621-61-1.jpg?t=%E5%B7%B2%E7%9F%A5a%2Bb-c%3D0%2C2a-b%2B2c%3Do%28c%E2%89%A00%EF%BC%89%E6%B1%823a-2b%2B5%2F5a-3b%2B2c%E7%9A%84%E5%80%BC%3F-4%2F11)
已知a+b-c=0,2a-b+2c=o(c≠0)求3a-2b+5/5a-3b+2c的值?-4/11
已知a+b-c=0,2a-b+2c=o(c≠0)求3a-2b+5/5a-3b+2c的值?
-4/11
已知a+b-c=0,2a-b+2c=o(c≠0)求3a-2b+5/5a-3b+2c的值?-4/11
由a+b-c=0 Ⅰ式 2a-b+2c=o Ⅱ式 c≠0
Ⅰ+Ⅱ得3a+c=0即c=-3a
2Ⅰ+Ⅱ得4a+b=0即b=-4a
将b=-4a c=-3a带入上式可得
原式=(3a+8a-15a)/(5a+12a-6a)=-4/11
a+b-c=0
2a-b+2c=0
c=a+b
2a-b+2a+2b=0
b=-4a
b=c-a
2a-c+a+2c=0
c=-3a
3a-2b+5c/5a-3b+2c
=3a+8a-15a/5a+12a-6a
=-4/11