Tìm x 3 x X + 12 = 24 12 : x = 4 X + X + X + X = 20 2 x 5 + 10 = x

2 câu trả lời

a, `3 × x + 12 = 24`

`3 × x = 24 - 12`

`3 × x = 12`

`x = 12 ÷ 3`

`x = 4`

b, `12 ÷ x = 4`

`12 ÷ 4 = x`

`⇒ x = 3`

c, `x + x + x + x = 20`

`4x = 20`

`x = 20 ÷ 4`

`x = 5`

d, `2 × 5 + 10 = x`

`⇒ x = 10 + 10`

`⇒ x = 20`

Xin hay nhất !

 `3 \times x + 12 = 24`

` 3 \times x = 12 + 24`

 `3 \times x = 36`

 `12 : x = 4`

`x = 12 : 4`

`x = 3`

`x + x + x +x = 20`

`4 \times x = 20`

`x = 20 : 4`

`x = 5`

`2 \times 5 + 10 = x`

`10 + 10 = x`

`20 = x`

`x = 20`