Question

giúp em mình với:))

câu1. 5.(7+48:x)=45

câu2.(x-105):21=15

câu3.575-(6.x+70)=445

câu4.541+(2+8-2.x)=734

câu5.46-6.(x+4)=40

câu6.27-3.(x-1)=12

câu7.123-5.(x+4)=38

câu8.231-(x-6)=1339:13

câu9[(6.x-39):3].28=5628

câu10.(x+1)+(x+2)+(x+3)+...+(x+100)=5770

câu11.720:[41-(2.x-5)]=8.5

Answer 1

1: =>48:x+7=9

=>48:x=2

=>x=24

2: =>(x-105)=315

=>x=420

3: =>6x+70=130

=>6x=60

hay x=10

Answer 2

em nên tách ra nhé!

câu`1.`

`5.(7+48:x)=45`

`=> 7+48:x=45 : 5`

`=> 7+48:x=9`

`=> 48:x=9-7`

`=> 48:x=2`

`=> x=48:2`

`=>x=24`

câu `2.`

`(x-105):21=15`

`=> x-105=15.21`

`=> x-105=315`

`=>x=315 + 105`

`=>x= 420`

câu `3.`

`575-(6.x+70)=445`

`=> 6.x+70=575-445`

`=> 6.x+70=130`

`=> 6.x= 130-70`

`=> 6.x= 60`

`=>x=60:6`

`=>x=10`

câu `4.`

`541+(2+8-2.x)=734`

`=> 10-2.x=734-541`

`=> 10-2.x=193`

`=> 2.x=193 + 10`

`=> 2.x=203`

`=>x=203 : 2`

`=>x= 203/2`

câu `5.`

`46-6.(x+4)=40`

`=> 6.(x+4)=46-40`

`=>  6.(x+4)=6`

`=>x+4=6:6`

`=>x+4=1`

`=>x=1-4`

`=>x=-3`

câu `6.`

`27-3.(x-1)=12`

`=>3.(x-1)=27-12`

`=>3.(x-1)=15`

`=>x-1=15:3`

`=>x-1=5`

`=>x=5+1`

`=>x=6`

câu `7.`

`123-5.(x+4)=38`

`=> 5.(x+4)=123-38`

`=> 5.(x+4)=85`

`=>x+4=85:5`

`=>x+4= 17`

`=>x=17-4`

`=>x=13`

câu `8.`

`231-(x-6)=1339:13`

`=> 231-(x-6)=103`

`=>x-6=231-103`

`=>x-6= 128`

`=>x=128 + 6`

`=>x= 134`