Bai 1 : tim x
a, x : 4 = 8542 + 3428
b, x * 7 = 69751 -24531
Bai 2 : Viet so thich hop vao cho cham
a , 2dm = …….. cm
b , 6 cm = ……..mm
c , 3 km = ………m
Bai 3 : Tinh
a , 6000 – 2000 + 800 =
b 8000 – ( 5000 – 2000 ) =
Bai 1 : tim x a, x : 4 = 8542 + 3428 b, x * 7 = 69751 -24531 Bai 2 : Viet so thich hop vao cho cham a , 2dm = …….. cm b , 6 cm = ……..mm c
By Quinn
Bài 1 :
a) x : 4 = 8542 + 3428
x : 4 = 11970
x = 11970 x 4
x = 47880
b) x*7 = 69751 – 24531
x*7 = 45220
x = 45220 : 7
x = 6460
Bài 2 :
a) 2 dm = 20 cm
b) 6 cm = 60 mm
c) 3 km = 3000 m
Bài 3 :
a) 6000 – 2000 + 800
= 4000 + 800
= 4800
b) 8000 – ( 5000 – 2000 )
= 8000 – 3000
= 5000
Bài 1:
a, x : 4 = 8542 + 3428
x : 4 = 11970
x = 11970 : 4
x = 2992.5
b, x * 7 = 69751 -24531
x * 7 = 45220
x = 45220/7
x = 6460
Bài 2:
a , 2dm = 20 cm
b , 6 cm = 60 mm
c , 3 km = 3000 m
Bài 3:
a , 6000 – 2000 + 800 = 4800
b 8000 – ( 5000 – 2000 ) = 5000