41-(2x-5)=18 2 mũ x .4=128 x+25=40 5.(x+35)=515 Question 41-(2x-5)=18 2 mũ x .4=128 x+25=40 5.(x+35)=515 in progress 0 Môn Toán Vodka 4 years 2020-10-20T07:17:10+00:00 2020-10-20T07:17:10+00:00 2 Answers 263 views -1
Answers ( )
Mình trình bày trong hình :
Bonus pé đậu mầm :333
Đáp án:
`41 – (2x – 5) = 18`
` 2x – 5 = 41 -18`
` 2x – 5 = 23`
` 2x = 23 + 5`
` 2x = 28`
` x = 28 : 2`
` x = 14`
Vậy `x = 14`
`2^x . 4 = 128`
` 2^x = 128 : 4`
` 2^x = 32`
` 2^x = 2^5`
`⇒ x = 5`
Vậy `x = 5`
`x + 25 = 40`
` x = 40 -25`
` x = 15`
Vậy `x = 15`
`5 . (x + 35) = 515`
` x + 35 = 515 : 5`
` x + 35 = 103`
` x = 103 – 35`
` x = 68`
Vậy `x = 68`