3a-a= x-0.43x= 3.5m+m= 4.3b+5.7b= 5a+8.7a= 7.5c-4.8c=

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3a-a=x-0.43x=3.5m+m=4.3b+5.7b=5a+8.7a=7.5c-4.8c=3a-a=x-0.43x=3.5m+m=4.3b+5.7b=5a+8.7a=7.5c-4.8c=3a-a

3a-a= x-0.43x= 3.5m+m= 4.3b+5.7b= 5a+8.7a= 7.5c-4.8c=
3a-a= x-0.43x= 3.5m+m= 4.3b+5.7b= 5a+8.7a= 7.5c-4.8c=

3a-a= x-0.43x= 3.5m+m= 4.3b+5.7b= 5a+8.7a= 7.5c-4.8c=
3a-a=2a
x-0.43x=0.57x
3.5m+m=4.5m
4.3b+5.7b=10b
5a+8.7a=13.7a
7.5c-4.8c=2.7c

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3a-a=(3-1)a=2a
x-0.43x=0.57x
3.5m+m=4.5m
4.3b+5.7b= 10b
5a+8.7a=13.7a
7.5c-4.8c=2.7c

a是变量的话,不是为0 吗 --- 3a-a=5a+8.7a a=0; 答案是0