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13 tháng 4 2015

4018

55545

3648

\(=\dfrac{15}{37}\cdot\dfrac{38}{41}-\dfrac{15}{37}\cdot\dfrac{74}{45}-\dfrac{38}{41}\cdot\dfrac{15}{37}-\dfrac{38}{41}\cdot\dfrac{82}{76}\)

\(=\dfrac{-1}{3}\cdot2-\dfrac{1}{2}\cdot2=-\dfrac{2}{3}-1=-\dfrac{5}{3}\)

a) \(47.69-31\left(-47\right)=47-69-\left(-31\right).47\)

\(=47.69+31.47=47.\left(69+31\right)=47.100=4700\)

b) \(16\left(38-2\right)-38\left(16-1\right)=16.38-16.2-38.16-\left(-38\right).1\)

\(=\left(16.38-38.16\right)-32+38=0-32+38=6\)

c) \(\left(-41\right)\left(59-2\right)+59\left(41-2\right)\) \(=\left(-41\right).59-\left[\left(-41\right).2\right]+59.41-59.2\)

\(=\left[\left(-41\right).59+59.41\right]-\left[\left(-49\right).2-51.2\right]=0-\left(-100\right).2=200\)

d) \(125.\left(-8\right)\left(-25\right)9.4.1000\div3=125.200.9.4.1000\div3\)

\(=\left(125.4\right)\left(9\div3\right)\left(200.1000\right)=500.3.200000=300000000\)

31 tháng 7 2023

a) \(-524\cdot\left[23+\left(-45\right)\right]+524\cdot\left(-45+123\right)\)

\(=-524\cdot\left[\left(23-45\right)-\left(-45+123\right)\right]\)

\(=-524\cdot\left(23-45+45-123\right)\)

\(=-524\cdot-100\)

\(=52400\)

b) \(47\cdot69-31\cdot\left(-47\right)\)

\(=-47\cdot\left(-69-31\right)\)

\(=-47\cdot-100\)

\(=4700\)

c) \(16\left(38-2\right)-38\left(16-1\right)\)

\(=16\cdot38-16\cdot2-38\cdot16+38\)

\(=-16\cdot2+38\)

\(=-36+38\)

\(=2\)

d) \(\left(-41\right)\cdot\left(59+2\right)+59\cdot\left(41-2\right)\)

\(=-41\cdot59-41\cdot2+41\cdot59-2\cdot59\)

\(=-41\cdot2-2\cdot59\)

\(=-2\left(41+59\right)\)

\(=-2\cdot100\)

\(=-200\)

e) \(25\cdot\left(-8\right)\cdot\left(-25\right)\cdot9\cdot4\cdot100^0:3\)

\(=\left(-1000\right)\cdot\left(-25\right)\cdot9\cdot4\cdot1:3\)

\(=25000\cdot9\cdot4:3\)

\(=25000\cdot3\cdot4\)

\(=100000\cdot3\)

\(=300000\)

a: \(=4\cdot2\cdot6\cdot25\cdot7\cdot5\)

\(=\left(4\cdot25\right)\cdot\left(2\cdot5\right)\cdot\left(6\cdot7\right)\)

\(=42\cdot100\cdot10=42000\)

b: \(=16\cdot38-16\cdot2-38\cdot16+38\)

\(=-32+38=6\)

 

a: \(\left(36-16\right)\cdot\left(-15\right)+16\cdot\left(-14-6\right)\)

\(=-15\cdot20+16\cdot\left(-20\right)=-20\cdot\left(-15+16\right)=-20\)

b: \(\left(-47\right)\cdot\left(-69\right)-\left(-31\right)\cdot47\)

\(=47\cdot69+31\cdot47\)

\(=47\cdot100=4700\)

c: \(38\cdot\left(-41\right)+59\cdot\left(-38\right)\)

\(=38\left(-41-59\right)\)

\(=-100\cdot38=-3800\)

25 tháng 10 2017

a) -4.2.6.25.(-7).5

= (2.5).(-4.25).(-7.6)

= 10.(-100).(-42)

= 42000

b) 16.(38 - 2) - 38.(16 - 1)

= 16.38 - 16.2 - 38.16 - 38

= -38 - 38

= -38.2

= -76.

c) Câu này đề không rõ nha.

6 tháng 1 2017

a,6

b,-200

c,1900

d,-900000

k mình nha 

mình cần gấp

6 tháng 1 2017

 16 . ( 38 - 2 ) - 38 . ( 16 - 1 )

=16 . 38 - 2 .16 - 38 .16 - 1.38

=16.38.(2.16-1.38)

=608.(32-38)

=608.(-6)

=-3648