`text{Đáp án + Giải thích các bước giải}`
`text{Bài 1:}`
`1)`
`A = (-2/3 + 1 1/4 - 1/6) . -24/10`
`A = (-2/3 + 5/4 - 1/6) . -24/10`
`A = (7/12 - 1/6) . -24/10`
`A = 5/12 . -24/10`
`A = -1`
Vậy `A=-1`
`text{____________________________________________________}`
`2)`
`B = 13/15 . 0,25 . 3 + (8/15 - 1 19/60) : 1 23/24`
`B = 13/60 . 3 + (8/15 - 79/60) : 47/24`
`B = 13/20 + (-47)/60 : 47/24`
`B = 13/20 + (-2)/5`
`B = 1/4`
Vậy `B=1/4`
`text{__________________________________________________}`
`text{Bài 2:}`
`a)`
`5,2x + 7 2/5 = 6 3/4`
`=> 5,2x + 37/5 = 27/4`
`=> 5,2x= 27/4 - 37/5`
`=> 5,2x= -13/20`
`=>x= -13/20 : 5,2`
`=>x= -1/8`
Vậy `x=-1/8`
`text{_____________________________________}`
`b) 2,4 : (-1/2 - x) = 1 3/5`
`=> 2,4 : (-1/2 - x) = 8/5`
`=>-1/2 - x = 2,4 : 8/5`
`=>-1/2 - x = 3/2`
`=>x = -1/2 - 3/2`
`=>x = -2`
Vậy `x=-2`
xin hay nhất.
ko sao chép.
mong MOD giữ ạ.
