`8/7`.x=`29/9`:`29/56`
`1/5`:x=`1/5`+`1/7`
`2/5`+`3/4`:x=`-1/2`
`1/2`x+`3/5`x=`-2/3`
`8/7`.x=`29/9`:`29/56` `1/5`:x=`1/5`+`1/7` `2/5`+`3/4`:x=`-1/2` `1/2`x+`3/5`x=`-2/3`
By Hadley
By Hadley
`8/7`.x=`29/9`:`29/56`
`1/5`:x=`1/5`+`1/7`
`2/5`+`3/4`:x=`-1/2`
`1/2`x+`3/5`x=`-2/3`
Đáp án:
Giải thích các bước giải:
`a)`
`8/7x=29/9:29/56`
`=>8/7x=56/9`
`=>x=8/7:56/9`
`=>x=9/49`
Vậy `x=9/49`
`b)`
`1/5:x=1/5+1/7`
`=>1/5:x=12/35`
`=>x=1/5:12/35`
`=>x=7/12`
Vậy `x=7/12`
`c)`
`2/5+3/4:x=-1/2`
`=>3/4:x=-1/2-2/5`
`=>3/4:x=-9/10`
`=>x=3/4:-9/10`
`=>x=-5/6`
Vậy `x=-5/6`
`d)`
`1/2x+3/5x=-2/3`
`=>11/10x=-2/3`
`=>x=-2/3:11/10`
`=>x=-20/33`
Vậy `x=-20/33`
*Lời giải :
8/7 . x = 29/9 : 29/56
-> 8/7 . x = 56/9
-> x = 56/9 : 8/7
-> x = 49/9
Vậy x = 49/9
1/5 : x = 1/5 + 1/7
-> 1/5 : x = 12/35
-> x = 1/5 : 12/35
-> x =7/12
Vậy x = 7/12
2/5 + 3/4 : x = -1/2
-> 3/4 : x = -1/2 – 2/5
-> 3/4 : x= -9/10
-> x = 3/4 : -9/10
-> x = -5/6
Vậy x = -5/6
1/2x + 3/5x = -2/3
-> (1/2 + 3/5)x = -2/3
-> 11/10x = -2/3
-> x = -2/3 : 11/10
-> x = -20/33
Vậy x = -20/33