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45 - 5 . (12 + 9)
= 45 - 5 . 21
= 45 - 105
= -60
-48 + 48 . (-78) + 48 . (-21)
= -48 + (-48) . 78 + (-48) . 21
= -48 . (78 + 21 + 1)
= -48 . 100
= -4800
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\dfrac{8}{5}\cdot\dfrac{45}{17}\cdot\dfrac{-25}{16}\cdot\dfrac{-34}{9}=\dfrac{8\cdot5\cdot9\cdot25\cdot17\cdot2}{5\cdot17\cdot8\cdot2\cdot9}=\dfrac{25}{9}\) (bỏ đi các dấu trừ vì số âm nhân số âm là số dương)
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35.18-5.7.28=35.18-35.28=35(18-28)=-350
45-5.12-5.9=45-60-45=-60
=24.16-24.5-16.24-16.5=5(-24-16)=5.-40=-200
35 . 18 - 5 . 7 . 28 = 35 . 18 - 35 . 28
= 35 . (18 - 28)
= 35 . (-10)
= -350
45 - 5 . (12 + 9) = 45 - 5 . 9 + 5 . 12
= 45 - 45 + 60
= 60
24 . (16 - 5) - 16 . (24 - 5) = 24 . 16 - 24 . 5 - 16 . 24 + 16 . 5
= (24 . 16 - 16 . 24) + (16 . 5 - 24 . 5)
=0 + 5 . (16 - 24)
= 5. (-8)
= -40
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A, 35×18-5×7×28 = 35x18-5x7x28
= 35x18-35x28
= 35(18-28)
= 35.(-10)
= -350
B, 45-5× (12+9) = 45-5x12-5x9
= 45-60-45
=(45-45)-60
= 0-60
=-60
= -350
A, 35×18-5×7×28 = 35x18-5x7x28
= 35x18-35x28
= 35(18-28)
= 35.(-10)
= -350
B, 45-5× (12+9) = 45-5x12-5x9
= 45-60-45
=(45-45)-60
= 0-60
=-60
![](https://rs.olm.vn/images/avt/0.png?1311)
-5 + (-37 - 45 + 51) - (-37 + 51)
= -5 - 37 - 45 + 51 + 37 - 51
= - (5 + 45) - (37 - 37) + (51 - 51)
= - 50 - 0 + 0
= - 50
- (15 - 47 + 58) + (15 - 47 ) + 3
= - 15 + 47 - 58 + 15 - 47 + 3
= (-15 + 15) + (47 - 47) - (58 - 3)
= 0 + 0 - 55
= - 55
(53 - 45 - 49) - (53 + 45 - 49)
= 53 - 45 - 49 - 53 - 45 + 49
= (53 - 53) + (-49 + 49) - (45 + 45)
= 0 + 0 - 90
= - 90
13 - 15 + 49 - 13 + 15 - 48
= (13 - 13) + (-15 + 15) + (49 - 48)
= 0 + 0 + 1
= 1
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\(\frac{\frac{1}{9}-\frac{5}{6}-4}{\frac{7}{12}-\frac{1}{36}-10}\)
\(=\frac{\frac{2}{18}-\frac{15}{18}-\frac{72}{18}}{\frac{21}{36}-\frac{1}{36}-\frac{360}{36}}\)
\(=\frac{\frac{-85}{18}}{\frac{-340}{36}}\)
\(=\frac{-85\cdot\frac{1}{18}}{-340\cdot\frac{1}{36}}\)
\(=\frac{-85\cdot\frac{2}{36}}{-340\cdot\frac{1}{36}}\)
\(=\frac{-85\cdot\left(\frac{2}{36}\div\frac{1}{36}\right)}{-340\cdot\left(\frac{1}{36}\div\frac{1}{36}\right)}\)
\(=\frac{-85\cdot2}{-340}\)
\(=\frac{-170}{-340}\)
\(=\frac{-1}{-2}\)
\(=\frac{1}{2}\)
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45-5x(12+9)
45-5x9+5x12
45-45-60
0-60
=-60
tk nha
45-5 x (12+9)
=45-5x21
=45-105
=-60