6%x+19x=22.5 70%x-18%x=3.12 28%x+37%x=22.75 78%x=39

问题描述:

6%x+19x=22.5 70%x-18%x=3.12 28%x+37%x=22.75 78%x=39

6%x+19x=22.5
0.06x+19x=22.5
19.06x=22.5
x=22.5/19.06=1.18
70%x-18%x=3.12
0.7x-0.18x=3.12
0.52x=3.12
x=6
28%x+37%x=22.75
0.28x+0.37x=22.75
0.65x=22.75
x=22.75/0.65=35
78%x=39
0.78x=39
x=39/0.78=50