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.
答
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...