Câu 1: 3 × x – 15 = 6 Câu 2: 5 × ( x – 7 ) = 25 10/08/2021 Bởi Abigail Câu 1: 3 × x – 15 = 6 Câu 2: 5 × ( x – 7 ) = 25
Câu 1: 3 × x – 15 = 6 3 × x = 6+15 3 × x = 21 x = 21 : 3 x = 7 Câu 2: 5 × ( x – 7 ) = 25 5 × x – 5 × 7 = 25 5 × x – 35 = 25 5 × x = 25 + 35 5 × x = 60 x = 60 : 5 x = 12 Bình luận
`3` x X `- 15 = 6` `3` x X `= 6 + 15` `3` x X `= 21` X `= 21 : 3` X `= 7` `5` × `( x – 7 ) = 25` `x – 7 = 25 : 5` `x `- 7 = 5` `x = 5 + 7 ` `x = 12`. Bình luận
Câu 1:
3 × x – 15 = 6
3 × x = 6+15
3 × x = 21
x = 21 : 3
x = 7
Câu 2:
5 × ( x – 7 ) = 25
5 × x – 5 × 7 = 25
5 × x – 35 = 25
5 × x = 25 + 35
5 × x = 60
x = 60 : 5
x = 12
`3` x X `- 15 = 6`
`3` x X `= 6 + 15`
`3` x X `= 21`
X `= 21 : 3`
X `= 7`
`5` × `( x – 7 ) = 25`
`x – 7 = 25 : 5`
`x `- 7 = 5`
`x = 5 + 7 `
`x = 12`.