Cach lam:
180 - m = 540-6m
180 - m + 6m = 540
180 + 5m = 540
5m = 540 - 180
5m = 360
=> m = 72.
Đúng 100%
Ta có: 180-m = 540-6m
180-m+6m = 540
180+5m = 540
5m = 540-180= 360
m = 360/5
m = 72
bai lam:
180-m=540-6m
180-m+6m=540
180+5m=540
5m=540-180
5m=360
m=360:5
m=72