`49/8 : x=1+44/5`

`=>49/8 : x= 5/5 +44/5`

`=>49/8;x=49/5`

`=>x=49/8 : 49/5`

`=>x= 49/8 xx 5/49`

`=>x= 5/8`

`816-2(x+3)=106`

`=> 2(x+3)=816-106`

`=> 2(x+3)= 710`

`=>x+3=710:2`

`=>x+3=355`

`=>x=355-3`

`=>x=352`

`5(x-1)-17=213 `

`=>5(x-1)= 213 + 17`

`=>5(x-1)= 230`

`=>x-1=230:5`

`=>x-1=46`

`=>x=46+1`

`=>x=47`

`2x-135=255`

`=>2x=255 + 135`

`=>2x= 390`

`=>x=390:2`

`=>x= 195`

`3/5 xx 2/3 :1/2 = 3/5 xx 2/3 xx 2= 6/15 xx 2= 12/15=4/5`

`a) 2 1/3 + 3 5/6 - 1 1/12=7/3 +23/6 - 13/12=28/12 + 46/12-13/12=(28+46-13)/12=61/12`

`b) 6/7 : ( 1/2 xx 3/4 ) - 5/8 = 6/7 : 3/8 - 5/8= 6/7 xx 8/3 - 5/8= 16/7-5/8=93/56`

`c) 34-2 :( 3/5 - 1/2 )=34-2 :1/10=34- 2 xx 10/1= 34- 20=14`

`đ) 4 1/2 + 1/2 : 5 1/2 =9/2 + 1/2 : 11/2= 9/2 + 1/2 xx 2/11=9/2 + 1/11=101/22`

cj kêu cô khóa acc ai mà giờ cô khóa acc em nè:<

tên hoàng :v