如果x/2=y/3=z/4,求(2x-y+3z)/(x+y-z)的值
1个回答
令x/2=y/3=z/4=a, 那么, x=2a; y=3a; z=4a, 代到(2x-y+3z)/(x+y-z)里面,就等于(4a-3a+12a)/(2a+3a-4a);
就等于13a/a = 13
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