Question

求13.2x＋9x=33.3,8x-3x=105的的解.

Answer 1

13.2x+9x=33.3

(13.2+9)x=33.3

22.2x=33.3

x=33.3/22.2=1.5

8x-3x=105

(8-3)x=105

5x=105

x=105/5

x=21.