B7 thực hiện các phép tính (tính nhanh nếu có thể)
a) -1/3 + 1/2 – 5/6 b) 7/11 – (3/5 + 7/11)
c) (11/22 + 5/11) – 19/22 d) 8/9 – 1/-9 + 1
e) 4/9 + 8/15 + -5/9 -2/11 + 7/15
y) -5/6 + 8/3 – 29/6 g) 2- 1/2 – 5/2
h) 1/4 – ( 1/3 + 1/6 – 1/12)
Giải nhanh giúp mik nha mik đag rất vội
Đáp án:
Giải thích các bước giải:
A,-1/3+1/2-5/6
=1/6-5/6
=-2/3
B,7/11-(3/5+7/11)
=68/55-7/11
=3/5
C,(11/22+5/11)-19/22
=21/22-19/22
=1/11
D, 8/9-1/9+1
=7/9+1
=16/9
E, 4/9+8/15+-5/9-2/11+7/15
=(4/9+5/9)+(8/15+7/15)-(-5/9)-2/11
=9/9+15/15+(-73/99)
=1+1+(-73/99)
=125/99
y,-5/6 + 8/3 – 29/6
=-5/6-29/6
=-17/3+8/3
=-3
g,2- 1/2 – 5/2
=3/2-5/2
=-1
h,1/4 – ( 1/3 + 1/6 – 1/12)
=1/4-5/12
=-1/6
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a,-1/3+1/2-5/6
=1/6-5/6
=-2/3
b,7/11-(3/5+7/11)
=68/55-7/11
=3/5
c,(11/22+5/11)-19/22
=21/22-19/22
=1/11
d, 8/9-1/9+1
=7/9+1
=16/9
e, 4/9+8/15+-5/9-2/11+7/15
=(4/9+5/9)+(8/15+7/15)-(-5/9)-2/11
=9/9+15/15+(-73/99)
=1+1+(-73/99)
=125/99
y,-5/6 + 8/3 – 29/6
=-5/6-29/6
=-17/3+8/3
=-3
g,2- 1/2 – 5/2
=3/2-5/2
=-1
h,1/4 – ( 1/3 + 1/6 – 1/12)
=1/4-5/12
=-1/6