(158×129-158×39)÷180
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\(\left(158x129-158x39\right):18\)
\(=\left[158\left(129-39\right)\right]:18\)
\(=158.90:18\)
\(=14220:18\)
\(=790\)
( 764 - 759 ) + ( 368 - 369 )
= 5 - 5 = 10
b) ( 4172 - 4168 ) - (1873 - 1869 )
= 4-4 = 0
( 158 x 129 - 158 x 39 ) : 180
= [ 158 x ( 129 - 39 ) ] : 180
= [ 158 x 90 ] : 180
= 14220 : 180
= 79
1) ( 158 x 129 - 158 x 39 ) : 180
= [158 x (129 - 39 ) ] : 180
= 158 x 90 : 180
= 158 x ( 90 : 180 )
= 158 x 1/2
= 158 : 2
= 79.
2)102- 96 +90-84+78-72+66-60+54-48
= ( 102 - 72 ) + ( -96 + 66 ) + ( 90 - 60 ) + ( -84 + 54 ) + ( 78 - 48 )
= 30 - 30 + 30 - 30 + 30 = 30
a: =762-325+138+125
=900-200=700
b; =-56(731+70-1)=-56*800=-44800
c: =-671+563-462-129-122
=-1384+563
-821
d: =-342-3485-234-158+3485
=-734
(158x168-158x58):11:10=158x(168-58):(11x10)=158x110:110=158x1=158
c. TH1:/-8/=8
=8+(-2).3
=8-6=2
TH2:/-8/=8
=-8+(-2).3
=-8.(-6)
=-48
d.-887.(113+457)+113(887-457)
=-887.570+113.430
=-505590+48590
=-457000
e.(16+39)+(158-16-39)
=55+103
=158
c, \(\left|-8\right|+\left(-2\right).3\) => \(8+\left(-6\right)\) = \(2\)
d, \(-887.\left(113+457\right)+113.\left(887-457\right)\)
=> \(\left(-887\right).113+\left(-887\right).457+113.887-113.\left(457\right)\)
=> \(\left[\left(-887\right).113+113.887\right]+\left[\left(-887\right).457-113.457\right]\)
=> \(\left[113.\left(887-887\right)\right]+\left[457.\cdot\left(-113-887\right)\right]\)
=> \(\left[113.0\right]+\left(457.-1000\right)\)
=> \(0+-457000=-457000\)
e, \(\left(16+39\right)+\left(158-16-39\right)\)
=> \(\left(16+39+158-16-39\right)\)
=> \(\left(16-16\right)+\left(39-39\right)+158\)
=> \(0+0+158=158\)
\(\left(158\cdot129-158\cdot39\right):180\)
\(=\dfrac{158\cdot\left(129-39\right)}{180}\)
\(=\dfrac{158\cdot90}{180}\)
\(=\dfrac{79\cdot2\cdot90}{2\cdot90}\)
\(=79\)