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a) 18.17−3.6.7
= 18.17 - 18 . 7
= 18 ( 17 - 7 )
= 18 . 10 = 180
b) 54−6.(17+9)
= 54 - 102 - 54
= - 102
c) 33.(17−5)−17.(33−5)
= 33. 17 - 33. 5 - 17 .33 + 17 . 5
= 17 . 5 - 33 . 5
= 5 ( 17 - 33 )
= 5. (-16)
= - 80
a) 18.17 - 3.6.7
= 18.17 - 18.7
= 18.(17 - 7 )
= 18 . 10
= 180
b) 54 - 6.(17 + 9)
= 6.9 - 6.17 + 6.9
= (6.9 - 6.9) - 6.17
= 0 - 6.17
= 0 - 102
= -102
c) 33.(17 - 5) - 17.(33 - 5)
= 33.17 - 33.5 - 17 . 33 - 17.5
= 33.(17 - 17) - 5.(33 - 17 )
= 33. 0 - 5.16
= 0 - 80
= -80
\(\frac{5}{17}.\frac{16}{33}+\frac{5}{33}.\frac{20}{17}-\frac{2}{17}.\frac{5}{33}\)
\(=\frac{5}{17}.\frac{16}{33}+\frac{5}{17}.\frac{20}{33}-\frac{5}{17}.\frac{2}{33}\)
\(=\frac{5}{17}.\left(\frac{16}{33}+\frac{20}{33}-\frac{2}{33}\right)\)
\(=\frac{5}{17}.\frac{34}{33}\)
\(=\frac{10}{33}\)
Chúc bạn học tốt !!!
a.18.17-3.6.7
=18.17-18.7
=18.(17-7)
=18.10=180
b.54-6.(17+9)
=54-6.26
=54-156=-102
c.33.(17-5)-17.(33-5)
=33.17-33.5-17.33+17.5
=33.5+17.5
=(33+17).5
=50.5=250
\(a,18.17-3.6.7\)
\(=18.17-18.7\)
\(=18.\left(17-7\right)\)
\(=18.10\)
\(=180\)
\(b,54-6.\left(17+9\right)\)
\(=54-6.17+6.9\)
\(=54-102+54\)
\(=\left(54+54\right)-102\)
\(=108-102\)
\(=6\)
\(c,33.\left(17-5\right)-17.\left(33-5\right)\)
\(=33.17-33.5-17.33-17.5\)
\(=\left(33.17-17.33\right)-\left[5\left(33-17\right)\right]\)
\(=0-5.16\)
\(=-80\)
\(\frac{\frac{6}{13}-\frac{6}{23}+\frac{6}{33}-\frac{6}{43}}{\frac{5}{13}-\frac{5}{23}+\frac{5}{33}-\frac{5}{43}}\)
= \(\frac{6.\left(\frac{1}{13}-\frac{1}{23}+\frac{1}{33}-\frac{1}{43}\right)}{5.\left(\frac{1}{13}-\frac{1}{23}+\frac{1}{33}-\frac{1}{43}\right)}\)
= \(\frac{6}{5}\)
k cho mình nhé
a) (-5) + (-248) = - (|-5| + |-248|) = - (5 + 248) = -253.
b) 17 + |-33| = 17 + 33 = 50.
c) |-37| + |15| = 37 + 15 = 52.
a) (-5) + (-258)
= -263
b) 17 + |-33|
= 17 + 33
= 50
c) |-37| + |+15|
= 37 + 15
= 52
33.(17 – 5) – 17.(33 -5)
= 33. 17 – 33.5 – 17.33 + 17.5
= (33.17 – 33. 17) + ( 17.5 – 33.5)
= 0 + 5.(17- 33)
= 5.(- 16) = -80