=(2.26).(-31)+26.162

=26(-31.2)+26.162

=26.(-62)+26.162

=26(-62+162)

=26.100

=2600

(-31).52+(-26).(-162)

( - 31 ) . 52 + ( - 26 ) . ( - 162 )

= ( - 31 ) . 52 + 26 . 162

= ( - 31 ) . 52 + 26 . 2 . 81

= ( - 31 ) . 52 + 52 . 81

= 52 . [ ( - 31 ) + 81 ]

= 52 . 50

= 2600

(-31) x 52 + (-26)x ( -162)

=(-31) x (-2) x (-26) + (- 26) x (-162)

= 62 x (-26) + ( - 26) x ( - 162)

=( -26)x [62 + (- 162)

=( - 26) x ( -100)

= 2600

a ) 1 12 + 2 3 + − 3 4 = 1 12 + 8 12 + − 9 12 = 0

b ) 1 2 − 2 5 + − 7 10 = 5 10 − 4 10 + − 7 10 = − 6 10 = − 3 5 c ) 1 2 + − 3 7 + 5 2 + − 4 7 = 1 2 + 5 2 + − 3 7 + − 4 7 = 2 d ) 9 8 − 4 7 + − 1 8 + 11 7 = 9 8 + − 1 8 + − 4 7 + 11 7 = 2 e ) 6 11 + − 2 3 + 5 11 = 6 11 + 5 11 + − 2 3 = 1 3 f ) − 1 2 + 11 4 − 11 4 − 1 2 = − 1 2 + 11 4 − 11 4 + 1 2 = 0

\(a,\left(326-43\right)+\left(174-57\right)\)

\(=326-43+174-57\)

\(=\left(326+174\right)-\left(43+57\right)\)

\(=500-100\)

\(=400\)

\(b,\left(-31\right).52+\left(-26\right).\left(-162\right)\)

\(=-1612+4212\)

\(=2600\)

Ta có:8=2³

         10=2.5

         24=2⁴.5

BCNN(...)=2³.5=24.5=40

b)Ta có:

16=2⁴

24=2³.3

BCNN(...)=2⁴.3=48

c)Ta có:

60=2².3.5

140=2².5.7

BCNN(...)=2².3.5.7=420

Mấy bài sau bn cứ lm như thế này nhé^^

đúng rồi bạn ơi

True

a) 52(-43)-52(55)-104

=52(-43)-52*55-52*2

=52(-43-55-2)

=52(-100)=-5200

a) -5200

b) 8985

c) 85

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