20 + 20 + 20 + 20 + 20 + 50 + 50 + 50 + 50
= 20 x 5 + 50 x 4
= 100 + 50 x 4
= 100 + 200
= 300
x + 50 - 20 = 50 + 20
x + 50 - 20 = 70
x + 50 = 70 + 20
x + 50 = 90
x = 90 - 50
x = 40
Ủng hộ tíck mik nha !!!
tính nhanh
20 + 20 + 20 + 20 + 20 + 50 + 50 + 50 + 50
= (20 x 5) + (50 x 4)
= 100 + 200
= 300
tìm x:
x + 50 - 20 = 50 + 20
x + 50 - 20 = 70
x + 50 = 70 + 20
x + 50 = 90
x = 90 - 50
x = 40
tchs mik tchs lại
Tính nhanh:
20 + 20 + 20 + 20 + 20 + 50 + 50 + 50 + 50
= 20 x 5 + 50 x 4
= 100 + 200
= 300
Tìm x:
x + 50 - 20 = 50 + 20
x + 50 - 20 = 70
x + 50 = 70 + 20
x + 50 = 90
x = 90 - 50
x = 40
20 + 20 + 20 + 20 + 20 + 50 + 50 + 50 + 50
= ( 20 + 50 ) + ( 20 + 50 ) + ( 20 + 50 ) + ( 20 + 50 ) + 20
= 70 + 70 + 70 + 70 + 20
= 70 x 4 + 20
= 280 + 20
= 300
tìm x
x + 50 - 20 = 50 + 20
x + 30 = 70
x = 70 - 30
x = 40
tính nhanh:
20 + 20 + 20 + 20 + 20 + 50 + 50 + 50 + 50=
= 20 . 5 + 50 . 4 = 100 + 200 = 300
tìm x :
x+50−20=50+20
x + 50 - 20 = 70
x + 50 = 70 + 20
x + 50 = 90
x = 90 - 50
=> x = 40
20 + 20 + 20 + 20 + 20 + 50 + 50 + 50 +50 = 300
x + 50 - 20 = 50 + 20
x + 50 - 20 = 70
x + 30 = 70
x = 70 - 30
x = 40
= 20 x 5 + 50 x 4
= 100 + 200
= 300
x + 50 - 20 = 70
x + 50 = 70 + 20 = 90
x = 90 - 50 = 40