\(=\left(23+17\right)+\left(12+28\right)-30=40+40-30=50\)
=(23+17)+(12+28)−30=40+40−30=50
nhớ tick đúng cho mik nhó
( 23 + 17 ) + ( 12 + 28 ) - 30 = 40 + 40 - 30 = 50
( 23 + 17 )+( 12 + 28 ) − 30 = 40 + 40 − 30 = 50
23 + 12 + 17 - 30 + 28
= (23 + 17) + (12 + 28) - 30
= 40 + 40 - 30
= 80 - 30
= 50.
23 + 12 + 17 - 30 + 28
= ( 23 + 17 ) + ( 28 + 12 ) - 30
= 40 + 40 - 30
= 50
=(23+17)+(12+28)−30=40+40−30=50=(23+17)+(12+28)−30=40+40−30=50
