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Bài `4:`
`a, 70-5(x-3)=45`
`5(x-3)=70-45`
`5(x-3)=25`
`x-3=25:5`
`x-3=5`
`x=8`
Vậy `x=8`
`b, 12+(5+x)=20`
`5+x=20-12`
`5+x=8`
`x=3`
Vậy `x=3`
`c, 130-(100+x)=25`
`100+x=130-25`
`100+x=105`
`x=5`
Vậy `x=5`
`d, 175 + (30-x)=200`
`30-x=200-175`
`30-x=25`
`x=5`
Vậy `x=5`
`e, 5(x+12)+22=92`
`5(x+12)=70`
`x+12=70:5`
`x+12=14`
`x=2`
Vậy `x=2`
`f, 95-5(x+2)=45`
`5(x+2)=95-45`
`5(x+2)=50`
`x+2=50:5`
`x+2=10`
`x=8`
Vậy `x=8`
`g, 10 + 2x = 4^5 : 4^3`
`10+2x=4^2=16`
`2x = 16-10`
`2x=6`
`x=6:2`
`x=3`
Vậy `x=3`
`h, 14x + 54=82`
`14x = 82-54`
`14x=28`
`x=28 : 14`
`x=2`
Vậy `x=2`
`i, 15x-133=17`
`15x=17+133`
`15x=150`
`x=150:15`
`x=10`
Vậy `x=10`
`j, 155-10(x+1)=55`
`10(x+1)=155-55`
`10(x+1)=100`
`x+1=100:10`
`x+1=10`
`x=9`
Vậy `x=9`
`k, 6(x+2^3)+40=100`
`6(x+8)=100-40`
`6(x+8)=60`
`x+8=60:6`
`x+8=10`
`x=2`
Vậy `x=2`
`l, 2^2 . (x+3^2)-5=55`
`4 . (x+9)=55+5`
`4.(x+9)=60`
`x+9=60:4`
`x+9=15`
`x=6`
Vậy `x=6`
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5
1
`a)70-5.(x-3)=45`
`5.(x-3)=70-45`
`5.(x-3)=25`
`(x-3)=25:5`
`x-3=5`
`x=5+3`
`x=8`
`vậy x=8`
`b)12+(5+x)=20`
`(5+x)=20-12`
`5+x=8`
`x=8-5`
`x=3`
`vậy x=3`
`c)130-(100+x)=25`
`(100+x)=130-25`
`100+x=105`
`x=105-100`
`x=5`
`vậy x=5`
`d)175+(30-x)=200`
`(30-x)=200-175`
`30-x=25`
`x=30-25`
`x=5`
`vậy x=5`
`e)5(x+12)+22=92`
`5(x+12)=92-22`
`5(x+12)=70`
`(x+12)=70:5`
`x+12=14`
`x=14-12`
`x=2`
`vậy x=2`
`f)95-5(x+2)=45`
`5(x+2)=95-45`
`5(x+2)=50`
`(x+2)=50:5`
`x+2=10`
`x=10-2`
`x=8`
`vậy x=8`
`g)10+2x=4^5:4^3`
`10+2x=4^2`
`10+2x=16`
`2x=16-10`
`2x=6`
`x=6:2
`x=3`
` vậy x=3`
`h)14x+54=82`
`14x=82-54`
`14x=28`
`x=28:14`
`x=2`
` vậy x=2`
`i)15x-133=17`
`15x=17+133`
`15x=150`
`x=150:15`
`x=10`
` vậy x=10`
`j)155-10(x+1)=55`
`10(x+1)=155-55`
`10(x+1)=100`
`(x+1)=100:10`
`x+1=10`
`x=10-1`
`x=9`
` vậy x=9`
`k)6(x+2^3)+40=100`
`6(x+2^3)=100-40`
`6(x+8)=60`
`(x+8)=60:6`
`x+8=10`
`x=10-8`
`x=2`
` vậy x=2`
`l)2^2.(x+3^2)-5=55`
`4.(x+9)=55+5`
`4.(x+9)=60`
`(x+9)=60:4`
`x+9=15`
`x=15-9`
`x=6`
` vậy x=6`
Hãy giúp mọi người biết câu trả lời này thế nào?
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