tìm x 20 – x = – 100 -50 – x = 100 7x – 10 = 6x + 20 4x – 15 = 5x + 25 12/11/2021 Bởi Everleigh tìm x 20 – x = – 100 -50 – x = 100 7x – 10 = 6x + 20 4x – 15 = 5x + 25
`20 – x = – 100` `=> x = 20 – (-100)` `=> x = 20 + 100` `= >x = 120` `-50 – x = 100` `=> x = -50 – 100` `= >x = = 150` `7x – 10 = 6x + 20` `=> 7x – 6x = 20 + 10` `= >x = 30` `4x – 15 = 5x + 25` `=> -25 – 15 = 5x – 4x` `=> -40 = x` `=> x = -40` XIN HAY NHẤT Ạ Bình luận
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`20 – x = – 100`
`=> x = 20 – (-100)`
`=> x = 20 + 100`
`= >x = 120`
`-50 – x = 100`
`=> x = -50 – 100`
`= >x = = 150`
`7x – 10 = 6x + 20`
`=> 7x – 6x = 20 + 10`
`= >x = 30`
`4x – 15 = 5x + 25`
`=> -25 – 15 = 5x – 4x`
`=> -40 = x`
`=> x = -40`
XIN HAY NHẤT Ạ