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`