1) 800:100=8
2)4:100=0.04
3)(45:100)*12=5.4
4)(60:100)*15=9
5)140:100*84=117.6
6)50:100*120=60
1) (x+2)×4=2×4+2×4
(x+2)×4=16
x+2=16:4
x+2=4
x=4-2
x=2
(2+2)×4=2×4+2×4
16=16
2) (5-3)×x=5x-3x
2x=2x
3)(5-3)×x=5x-3×2
2x=5x-6
(20+4):2=24:2=12
(20+4):2 = 20:2+4:2=10+2=12