làm giúp mk với a, 56/75 x 50/42 + 17/25 : 34/15 b, hỗn số nha : 3 2/3 : 2 3/4 + 9/12 x 8/27 – 1 1/6 c, 60/75 x 25% : 3/5 – 2/15 d, ( 126% – 8% ) : 4 + 12,05
By Kinsley
làm giúp mk với a, 56/75 x 50/42 + 17/25 : 34/15 b, hỗn số nha : 3 2/3 : 2 3/4 + 9/12 x 8/27 – 1 1/6 c, 60/75 x 25% : 3/5 – 2/15 d, ( 126% – 8% ) : 4 + 12,05
`a, 56/75 xx 50/42 + 17/25 : 34/15`
`= 8/9 + 17/25 xx 15/34`
`= 8/9 + 3/10`
`= 80/90 + 27/90`
`= 107/90`
`b, 3 2/3 : 2 3/4 + 9/12 xx 8/27 – 1 1/6`
`= 11/3 : 11/4 + 2/9 – 7/6`
`= 11/3 xx 4/11 + 2/9 – 7/6`
`= 4/3 + 2/9 – 7/6`
`= 24/18 + 4/18 – 21/18`
`= 28/18 – 21/18`
`= 7/18`
`c, 60/75 xx 25% : 3/5 – 2/15`
`= 4/5 xx 1/4 xx 5/3 – 2/15`
`= 1/5 xx 5/3 – 2/15`
`= 1/3 – 2/15`
`= 5/15 – 2/15`
`= 1/5`
`d, ( 126% – 8% ) : 4 + 12,05`
`= 118% : 4 + 1205/100`
`= 59/50 xx 1/4 + 1205/100`
`= 59/200 + 1205/100`
`= 59/200 + 2410/200`
`= 2469/200`
Đáp án:
Giải thích các bước giải:
a, 56/75 x 50/42 + 17/25 : 34/15
=8/9+3/10
=80/90+27/90
=107/90
b,3 2 : 2 3 +9/12 x 8/27-1 1
3 4 6
=11/3 : 11/4+2/9-7/6
=4/3+2/9-7/6
=14/9-7/6
=7/18
c, 60/75 x 25 % : 3/5 -2/15
=1/5 : 3/5 -2/15
=1/3-2/15
=1/5
d, ( 126% – 8% ) : 4 + 12,05
=118% : 4 + 12,05
=0,295+12,05
=12,345