`#3107`
`1.`
`17 + 3(2x + 24) = 107`
`=> 3(2x + 24) = 107 - 17`
`=> 3(2x + 24) = 90`
`=> 2x + 24 = 90 \div 3`
`=> 2x + 24 = 30`
`=> 2x = 30 - 24`
`=> 2x = 6`
`=> x = 3`
Vậy,` x = 3`
`2,`
`2(15 + 3x) + 124 = 178`
`=> 2(15 + 3x) = 178 - 124`
`=> 2(15 + 3x) = 54`
`=> 15 + 3x = 54 \div 2`
`=> 15 + 3x = 27`
`=> 3x = 27 - 15`
`=> 3x = 12`
`=> x = 4`
Vậy, `x = 4`
`3.`
`27 + 3(17 - 4x) = 54`
`=> 3(17 - 4x) = 54 - 27`
`=> 3(17 - 4x) = 27`
`=> 17 - 4x = 9`
`=> 4x = 8`
`=> x = 2`
Vậy, `x = 2`
`4.`
`4(75 - 5x) + 142 = 302`
`=> 4(75 - 5x) = 302 - 142`
`=> 4(75 - 5x) = 160`
`=> 75 - 5x = 160 \div 4`
`=> 75 - 5x = 40`
`=> 5x = 75 - 40`
`=> 5x = 35`
`=> x = 7`
Vậy, `x = 7`
`5.`
`26 + 4(6x - 7) = 118`
`=> 4(6x - 7) = 118 - 26`
`=> 4(6x - 7) = 92`
`=> 6x - 7 = 23`
`=> 6x = 30`
`=>x = 5`
Vậy, `x = 5.`
`10.`
`4(53 - 5x) - 52 = 80`
`=> 4(53 - 5x) = 80 + 52`
`=> 4(53 - 5x) = 132`
`=> 53 - 5x = 33`
`=> 5x = 53 - 33`
`=> 5x = 20`
`=> x = 4`
Vậy,` x = 4`
`11.`
`119 - 3(7x - 4) = 47`
`=> 3(7x - 4) = 119 - 47`
`=> 3(7x - 4) = 72`
`=> 7x - 4 = 24`
`=> 7x = 28`
`=> x = 4`
Vậy, `x = 4`
`12.`
`2(11x - 42) - 18 = 8`
`=> 2(11x - 42) = 8 + 18`
`=> 2(11x - 42) = 26`
`=> 11x - 42 = 26 \div 2`
`=> 11x - 42 = 13`
`=> 11x = 55`
`=> x = 5`
Vậy, `x = 5`
`13.`
`136 - 16 \div x = 134`
`=> 16 \div x = 136 - 134`
`=> 16 \div x = 2`
`=> x = 16 \div 2`
`=> x = 8`
Vậy, `x = 8`
`14.`
`178 - 35 \div x = 173`
`=> 35 \div x = 178 - 173`
`=> 35 \div x = 5`
`=> x = 35 \div 5`
`=> x = 7`
Vậy, `x = 7.`
Bài 4:
1/ \(17+3\left(2x+24\right)=107\)
\(3\left(2x+24\right)=107-17\)
\(3\left(2x+24\right)=90\)
\(2x+24=90:3\)
\(2x+24=30\)
\(2x=30-24\)
\(2x=6\)
\(x=6:2\)
\(x=3\)
2/ \(2\left(15+3x\right)+124=178\)
\(2\left(15+3x\right)=178-124\)
\(2\left(15+3x\right)=54\)
\(15+3x=54:2\)
\(15+3x=27\)
\(3x=27-15\)
\(3x=12\)
\(x=12:3\)
\(x=4\)
3/ \(27+3.\left(17-4x\right)=54\)
\(3\left(17-4x\right)=54-27\)
\(3\left(17-4x\right)=27\)
\(17-4x=27:3\)
\(17-4x=9\)
\(4x=17-9\)
\(4x=8\)
\(x=8:4\)
\(x=2\)
4/ \(4.\left(75-5x\right)+142=302\)
\(4\left(75-5x\right)=302-142\)
\(4\left(75-5x\right)=160\)
\(75-5x=160:4\)
\(75-5x=40\)
\(5x=75-40\)
\(5x=35\)
\(x=35:5\)
\(x=7\)
5/ \(26+4.\left(6x-7\right)=118\)
\(4\left(6x-7\right)=118-26\)
\(4\left(6x-7\right)=92\)
\(6x-7=92:4\)
\(6x-7=23\)
\(6x=23+7\)
\(6x=30\)
\(x=30:6\)
\(x=5\)
10/ \(4.\left(53-5x\right)-52=80\)
\(4\left(53-5x\right)=80+52\)
\(4\left(53-5x\right)=132\)
\(53-5x=132:4\)
\(53-5x=33\)
\(5x=53-33\)
\(5x=20\)
\(x=20:5\)
\(x=4\)
11/ \(119-3.\left(7x-4\right)=47\)
\(3\left(7x-4\right)=119-47\)
\(3\left(7x-4\right)=72\)
\(7x-4=72:3\)
\(7x-4=24\)
\(7x=24+4\)
\(7x=28\)
\(x=28:4\)
\(x=7\)
12/ \(2.\left(11x-42\right)-18=8\)
\(2\left(11x-42\right)=8+18\)
\(2\left(11x-42\right)=26\)
\(11x-42=26:2\)
\(11x-42=13\)
\(11x=13+42\)
\(11x=55\)
\(x=55:11\)
\(x=5\)
13/ \(136-16:x=134\)
\(16:x=136-134\)
\(16:x=2\)
\(x=16:2\)
\(x=8\)
14/ \(178-35:x=173\)
\(35:x=178-173\)
\(35:x=5\)
\(x=35:5\)
\(x=7\)
\(#WendyDang\)
