Đáp án:
Giải thích các bước giải:
a) 25% - 5/4 +1/5/6
= 1/4 - 5/4 + 11/6
= 5/6
b) 75% : 2/1/5 -(0,5)^2 .(-7) + 2,5 .(7/2/3 - 5/2/3 )
= 3/4 : 11/5 + 7/4 + 5/2( 23/3 - 17/3 )
= 3/4 . 5/11 + 7/4 + 115/6 - 85/6
= 78/11
c) 45 : 2/4/7 + 50% - 1.25
= 45 : 18/7 + 1/2 - 5/4
= 45 . 7/18 + 1/2 - 5/4
= 67/4
d) 4/2/3 . 0,5 - 1/3/7 . 14% + (-0,8)
= 14/3 . 1/2 - 10/7 . 7/50 - 4/5
= 4/3
e) 2/3/4 .(-0,4 ) - 1/3/5 . 2,75 + (-1,2 ): 4/11
= 11/4 . (-2/5 ) - 8/5 . 11/4 - 6/5 . 11/4
= -44/5
f) 1,4 . 15/49 - ( 4/5 + 2/3 ) : 2/1/5
= 7/5 . 15/49 - (4/5 + 2/3) : 11/5
= 7/5 . 15/49 - (4/5 + 2/3) . 5/11
= -5/21
