y . 10 = 1000
y = 1000 : 10
y = 100
y . 10 = 1000
y = 1000 : 10
y = 100
1000 - 345 + 345 : y
y : 2 x 5 +1234=2234
tìm x:
10 . x + 10 = 1000
Tìm y :2020-y:8*10=1000
Tính nhẩm:
a) 27 × 10 = …...; 72 × 100 =…...; 14 × 1000 =…...
86 × 10 = …...; 103 × 10 =…...; 452 × 1000 =…...
358 × 10 = …...; 1977 × 100 =…...; 300 × 1000 =…...
b) 80 : 10 = …...; 400 : 100 =…... ;6000 : 1000 =…...
300 : 10 = …...; 4000 : 100 =…... ;60000 : 1000 =…...
2000 : 10 =…...; 40000 : 100 =…... ;600000 : 1000 =…...
c) 64 × 10 =…...; 32 × 100 =…...; 95 × 1000 =…...
640 : 10 =…...; 3200 : 100 =…...; 95000 : 1000 =…...
tìm y biết 2020 - y/ 8*10=1000
tìm x :
203 - x + 10 = 1000
Tìm y biết: 2020 - y : 8 x 10 = 1000
tìm x
x X 10 - x - x = 1000
tìm x:
x : 10 x 100 = 1000 + 100