5/5 + 9/9 + 16/7 + 1 =
1/5 + 2/9 + 4/5 +16/7
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=(39/4:26/5+17/5×75/34):(-25/16)
=(39/4×5/26+17/5×75/34):(-25/16)
=(15/8+15/2):(-25/16)
=75/8:(-25/16)
=75/8×(-16/25)
=-6
a) 1/2 + 3/4 - (3/4 - 4 - 5)
= 1/2 + 3/4 - 3/4 + 4 + 5
= (3/4 - 3/4) + (4 + 5) + 1/2
= 0 + 9 + 1/2
= 19/2
b) [9/16 + 8/(-27)] - (19/27- 7/16 - 2)
= 9/16 - 8/27 - 19/27 + 7/16 + 2
= (9/16 + 7/16) + (-8/27 - 19/27) + 2
= 1 - 1 + 2
= 2
c) -5/8 . [4/9 + 7/(-12)]
= -5/8 . (-5/36)
= 25/288
d) 7/10 . (-3/5) + 7/10 . (-2/5) - (-3/10)
= 7/10 . (-3/5 - 2/5) + 3/10
= 7/10 . (-1) + 3/10
= -2/5
e) -3/7 . 5/9 + 4/9 . (-3/7) + 2 3/7
= -3/7 . (5/9 + 4/9) + 17/7
= -3/7 . 1 + 17/7
= 2
f) 8 2/7 - (3 4/9 + 4 2/7)
= 8 + 2/7 - 3 - 4/9 - 4 - 2/7
= (8 - 3 - 4) + (2/7 - 2/7) - 4/9
= 1 - 4/9
= 5/9
h) 3.(-1/2)² - (4/5 + 8/15) : 5/6
= 3.1/4 - 4/3 : 5/6
= 3/4 - 8/5
= -17/20
\(\frac{5}{5}+\frac{9}{9}+\frac{16}{7}+1\)
\(=\left(\frac{5}{5}+\frac{9}{9}+1\right)+\frac{16}{7}\)
\(=\left(1+1+1\right)+\frac{16}{7}\)
\(=3+\frac{16}{7}\)
\(=\frac{37}{7}\)
\(\frac{1}{5}+\frac{2}{9}+\frac{4}{5}+\frac{16}{7}\)
\(=\left(\frac{1}{5}+\frac{4}{5}\right)+\left(\frac{2}{9}+\frac{16}{7}\right)\)
\(=1+\frac{158}{63}\)
\(=\frac{221}{63}\)
5/5 + 9/9 + 16/7 + 1 = 37/7
1/5 + 2/9 + 4/5 +16/7= 221/63