1. X x 5 + 122 + 236 = 633
2. 320 + 3 x X = 620
3. 357 : X = 5 dư 7
4. X : 4 = 1234 dư 3
5. 120 – (X x 3) = 30 x 3
6. 357 : (X + 5) = 5 dư 7
7. 65 : x = 21 dư 2
8. 64 : X = 9 dư 1
1. X x 5 + 122 + 236 = 633
2. 320 + 3 x X = 620
3. 357 : X = 5 dư 7
4. X : 4 = 1234 dư 3
5. 120 – (X x 3) = 30 x 3
6. 357 : (X + 5) = 5 dư 7
7. 65 : x = 21 dư 2
8. 64 : X = 9 dư 1
1)` x×5+122+236=633`
`x×5=633-122-236`
`x×5=275`
`x=275÷5`
`x=55`
2)` 320+3×x=620`
`3×x=620-320`
`3×x=300`
`x=300÷3`
`x=100`
3) `357÷x=5` dư `7`
`(357-7)÷x=5`
`350÷x=5`
`x=350÷5`
`x=70`
4)`x÷4=1234` dư `3`
`(x-3)÷4=1234`
`x-3=4936`
`x=4936+3`
`x=4939`
5)`120-(x×3)=30×3`
`120-(x×3)=90`
`x×3=120-90`
`x×3=30`
`x=30÷3`
`x=10`
6)`357÷(x+5)=5` dư `7`
`(357-7)÷(x+5)=5`
`350÷(x+5)=5`
`x+5=350÷5`
`x+5=70`
`x=70-5`
`x=65`
7) `65÷x=21` dư `2`
`(65-2)÷x=21`
`63÷x=21`
`x=63÷21`
`x=3`
8) `64÷x=9` dư `1`
`(64-1)÷x=9 `
`63÷x=9 `
`x=63÷9`
`x=7`
1. 2. 3.
x×5+122+236=633 320+3×x=620 357÷x=5(dư 7)
x×5 =633-236-122 3×x=620-320 357÷x=12
x×5 =275 3×x=300 x=357÷12
x=275÷5 x=300÷3 x=29,75
x=55 x=100
4. 5. 6.
x÷4=1234(dư 3) 120-(x×3)=30×3 357÷(x+5)=5(dư 7)
x÷4=1237 120-(x×3)=90 357÷(x+5)=12
x=1237×4 x×3=120+90 x+5=357×12
x=4948 x×3=210 x+5=4284
x=210÷3 x=4284-5
x=70 x=4279