-4/11+5/6+7/11-5/6
=(-4/11+7/11)+(5/6-5/6)
=3/11+0
=3/11
Làm là giúp đủ 3 câu hộ mình. 1 câu k k đâu !
3/7*(0,5+11/2)-2/7:25%
=3/7*(0,5+11/2)-2/7:1/4
=3/7*(0,5+11/2)-2/7*4
=3/7*(1/2+11/2)-2/7*4
=3/7*6-2/7*4
=18/7-8/7
=10/7
Đề giữa
=-5/6*7/13+19/13*-5/6+2/5
=(7/13+19/13)*-5/6+2/5
=2*-5/6+2/5
=-5/3+2/5
=-19/15
a) -4/11 + 5/6 + 7/11 - 5/6 = 5/6 - 5/6 + 7/11 - 4/11 = 3/11
b) -5/6 . 7/13 + 19/13 : 6/-5 + 2/5 = -5/6 . 7/13 + 19/13 . -5/6 + 2/5
= -5/6 (7/13 + 19/13) + 2/5 = -5/6 . 26/13 + 2/5
= -5/6 . 2 + 2/5 = -5/3 + 2/5 = -19/15
c) 3/7 . (0,5 + 1 1/2) - 2/7 : 25% = 3/7 . (0,5 + 1,5) - 2/7 . 100/25
= 3/7 . 2 - 2/7 . 4 = 6/7 - 8/7 = -2/7