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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)524.[23+(-45)] + 524.(-45+123)
=524.(-22) + 524.78
=524.(-22+78)
=524.100
=52400
a)47.69-31.(-47)
=(47-47).69-31
=0.69-31
=690-31
=659
a. 47.69 - 31 .(-47)
=47 . 69 - (-31) .47
=47 . (69+31)
=47 . 100 = 4700
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) \(125.\left(-8\right)\left(-25\right)9.4.1000\div3=125.200.9.4.1000\div3\)
\(=\left(125.4\right)\left(9\div3\right)\left(200.1000\right)=500.3.200000=300000000\)
-524[23+(-45)]+524(-45+123)\(=524.[-23+\left(-45\right)+\left(-45\right)+123]\)
\(=524.[\left(-23+123\right)+\left(-45+-45\right)]\)
\(=524.[100+\left(-90\right)]\)
\(=524.10=5240\)
HTDT
a,5200
b, -4800
c,-4700
d,52400
e,37
sorry nha,mk ko giải ra đc
bn thông cảm
\(a,\left(5318-46+151\right)-\left(318-146+51\right)\)
\(=5318-46+151-318+146-51\)
\(=5000+100+100=5200\)
\(b,48.154-48.254\)
\(=48.\left(154-254\right)\)
\(=48.\left(-100\right)=-4800\)
a) 10-x-5=-5-7-11
=> 5 - x = -23
=> x = 28
b) |x| -3=0
=> |x| = 3
=> x = 3 hoặc x -3
c) ( 7-|x| ) .(2x-4)=0
=> 7 - |x| = 0 hoặc 2x - 4 = 0
=> |x| = 7 hoặc 2x = 4
=> x = 7 hoặc x = - 7 hoặc x = 2
c)2+3x=-15-19
=> 2 + 3x = -34
=> 3x = 36
=> x = 12