以知a=2b,c=2a(a.b.c不为0,求代数式4a+2b-c分之a-b+c的值
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以知a=2b,c=2a(a.b.c不为0,求代数式4a+2b-c分之a-b+c的值
以知a=2b,c=2a(a.b.c不为0,求代数式4a+2b-c分之a-b+c的值
以知a=2b,c=2a(a.b.c不为0,求代数式4a+2b-c分之a-b+c的值
a=2b c=2a=4b
a-b+c/4a+2b-c
=2b-b+4b/8b+2b-4b
=5/6
a=2b,c=2a;
c=2a=4b
a=2b
(a-b+c)/(4a+2b-c)
=(2b-b+4c)/(8b+2b-4b)
=5/6
1.2b
5/6
5/6
先将c=2a,然后4a-2a=2a,2a=4b,所以4a+2b-c=6b;
有因为c=2a,所以a-b+c=-2b-b=b
所以6b/b=6