120 : 30 x 100 + 1000 - 100 =?
= 4 x 100 + 1000 - 100
= 400 + 1000 - 100
= 1400 - 100
= 1300
120 : 30 x 100 + 1000 - 100
= 4 x 100 + 1000 - 100
= 400 + 1000 - 100
= 1400 - 100
= 1300
=4x100+1000-100
=400+1000-100
=1400-100
=1300
120 : 30 * 100 + 1000 - 100
= 4 * 100 + 1000 - 100
= 400 + 1000 - 100
= 1400 - 100
= 1300