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
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`