0.7x+3.4x=117.26 (5.6+x)÷7=3.9 7(x-2.5)=25.

问题描述:

0.7x+3.4x=117.26 (5.6+x)÷7=3.9 7(x-2.5)=25.

7x+3.4x=117.2610.4x=117.26x=11.275(5.6+x)÷7=3.95.6+x=3.9*7        x=21.73.     7(x-2.5)=25       7x-17=25       7x=42&nb...