a) 7*5^2 - 6*4^2
b)16*24+76*16+(-1600)
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a) 4.(13 - 16) - (3-5) .(-3)2
b) -2/5+ 7/11+ -11/10 + 7/-11
c) 1/2+2/3+1/6+-2/5
d) 34 .4-66/ 35.5+10.34
a) Ta có: \(4\cdot\left(13-16\right)-\left(3-5\right)\cdot\left(-3\right)^2\)
\(=4\cdot13-4\cdot16+2\cdot9\)
\(=52-64+18\)
=6
b) Ta có: \(-\dfrac{2}{5}+\dfrac{7}{11}+\dfrac{-11}{10}+\dfrac{7}{-11}\)
\(=-\left(\dfrac{2}{5}+\dfrac{11}{10}\right)+\left(\dfrac{7}{11}-\dfrac{7}{11}\right)\)
\(=-\left(\dfrac{4}{10}+\dfrac{11}{10}\right)\)
\(=\dfrac{-15}{10}=\dfrac{-3}{2}\)
2/5 + 11/15 = 17/15
7/8 - 7/9 = 7/72
11/13 x 26/31 = 22/31
16/24 : 4 = 1/6
30 : 6/5 = 25
9/16 : 4 = 9/64
1/2 : 1/3 x 8/15 = 3/2 x 8/15 = 4/5
a)\(\dfrac{-5}{6};\dfrac{-3}{4};\dfrac{7}{24};\dfrac{2}{3};\dfrac{7}{8};\dfrac{16}{17}\)
b)\(\dfrac{20}{23};\dfrac{205}{107};\dfrac{214}{315};\dfrac{7}{10};\dfrac{-5}{8};\dfrac{-16}{19}\)
a) 2 × 9 + 63 = 18 + 63 = 81
b) 24 : 4 + 44 = 6 + 44 = 50
c) 5 × 6 – 12 = 30 – 12 = 18
d) 3 × 7 – 16 = 21 – 16 = 5
a) 7 . 52 - 6 . 42
= 7 . 25 - 6 . 16
= 175 - 96
= 79
b) 16 . 24 + 76 . 16 + (-1600)
= 16 . (24+76) + (-1600)
= 16 . 100 + (-1600)
= 1600 + (-1600)
= 0
#Hok_tốt
\(a,7\times5^2-6\times4^2=\)
\(=7\times25-6\times16\)
\(=175-96\)
\(=79\)
\(b,16\times24+76\times16+\left(-1600\right)=\)
\(=16\times\left(24+76\right)+\left(-1600\right)\)
\(=16\times100+\left(-1600\right)\)
\(=1600+\left(-1600\right)\)
\(=0\)