8X-4.2=22.4和19.2+7.8X=21.93

问题描述:

8X-4.2=22.4和19.2+7.8X=21.93

8x=17.2 x=2.15
7.8x=2.73 x=0.35


8x-4.2=22.4
8x=22.4+4.2
8x=26.6
x=3.325
19.2+7.8x=21.93
7.8x=21.93-19.2
7.8x=2.73
x=2,73÷7.8
x=0.35