a , 82/11-(8/5+27/11) b , -3/8×9/14+5/14x-3/8+1,25 c , 23/15×0,75-(11/20+25%):(-2/5)^2 12/10/2021 Bởi Elliana a , 82/11-(8/5+27/11) b , -3/8×9/14+5/14x-3/8+1,25 c , 23/15×0,75-(11/20+25%):(-2/5)^2
a)82/11 – (8/5 + 27/11) =82/11 – 8/5 – 27/11 =(82/11 – 27/11)- 8/5 =55/11 – 8/5 = 5 – 8/5 = 17/5 b)-3/8 . 9/14 + 5/14 . -3/8 + 1,25 =-3/8.(9/14 + 5/14) + 1,25 =-3/8.1 + 1,25 =-3/8 +1+0,25 =5/8 + 1/4 =7/8 c)23/15 . 0,75 -(11/20 + 25%):(-2/5)^2 =23/20 – 11/20 – 25%:4/25 =3/5 – 1/4 : 4/25 =3/5 – 25/16 =-77/80 Bình luận
a)82/11 – (8/5 + 27/11)
=82/11 – 8/5 – 27/11
=(82/11 – 27/11)- 8/5
=55/11 – 8/5
= 5 – 8/5
= 17/5
b)-3/8 . 9/14 + 5/14 . -3/8 + 1,25
=-3/8.(9/14 + 5/14) + 1,25
=-3/8.1 + 1,25
=-3/8 +1+0,25
=5/8 + 1/4
=7/8
c)23/15 . 0,75 -(11/20 + 25%):(-2/5)^2
=23/20 – 11/20 – 25%:4/25
=3/5 – 1/4 : 4/25
=3/5 – 25/16
=-77/80