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A. 176+483+24+117
=176+24+483+117
=200+600
=800
B. Chịu
C. 25*50*4*20
=(25*4)*(50*20)
=100*1000
=100000
D. 24*19+29*24+18*24+24*33+24
=24 * (19+29+18+33)+24
=24*99+24
=2376+24
=2400
K mk nhé
a) 176+483+24+117=(176+24)+(483+117)=200+600=800
b) 32+33+34+...+78+79+80=(32+80)+(33+79)+...+(55+57)+56=112+112+...+112+56(có 24 số112)=112.24+56=2688+56=2744
c)25.50.4.20=(25.4).(50.20)=100.1000=100000
d)24.19+29.24+18.24+24.33+24=24.(19+29+18+33+1)=24.100=2400
a) 23 + 25 + 27 + 29 + 31 + 33 + 35
= 23 + ( 25 + 35 ) + ( 27 + 33 ) + ( 29 + 31 )
= 23 + 60 + 60 + 60
= 23 + 60 x 3
= 23 + 180
= 203
b) 4 . 36 . 25 . 50
= 4 . 4 .9 . 25 . 25 . 2
= 4 . 25 . 4 . 25 . 9 . 2
= 100 . 100 . 9 . 2
= 10 000 . 18
= 180 000
c) 32 . 125 . 3
= 4 . 8 . 5 . 25 . 3
= 4 . 25 . 8 . 5 . 3
= 100 . 8 . 5 . 3
= 800 . 5 . 3
= 4000 . 3
= 12000
d, 36 . 19 + 36 . 81
= 36 . ( 19 + 81 )
= 36 . 100
= 3600
e, 78 . 31 + 78 . 24 + 78 . 17 + 22 x 72
= 78 . ( 31 + 24 + 17 ) + 22 x 72
= 78 . 72 + 22 . 72
= 72 . ( 78 + 22 )
= 72 . 100
= 7200
A)23+25+27+29+31+33+35
= (33+27)+(25+35)+(29+31)+23
=60+60+60+23
=60x3+23
=180+23
=203
B)4.36.25.50=(36.25).(4.50)
=(4.9.25).(2.2.50)
=(4.25).9 .(2.50).2
=100.9.100.2
=100.(9+2)
=100 .11
=1100
C)32.125.3=(4.8).125.3
=(125.8).(4.3)
=1000.12
=12000
D)36.19.36.81=36.(19+81)
= 36.100
=3600
E)78.31.+78.24+78.17+22x72=78.31+78.24+78.17+ (16+6).72
=78.31+78.24+78.17+78.16
=78.(31+24+17+16)
=78.88
=6864
A = 78 x 31 + 78 x 24 + 78 x 17 + 22 x 72
A = 78 x ( 31 + 24 + 17 ) + 22 x 72
A = 78 x 72 + 22 x 72
A = 72 x ( 78 + 22 )
A = 72 x 100
A = 7200
C = 53 x 39 + 47 x 39 - 53 x 21 - 47 x 21
C = 39 x ( 53 + 47 ) - 21 x ( 53 - 47 )
C = 39 x 100 - 21 x 6
C = 3900 - 126
C = 3774
a ) x + 36 =98
x = 98 -36
x = 62
x * 8 = 56
x = 56 : 8
x = 7
b ) 16 + 32 = 48
39 + 25 = 64
c) tính nhanh :
36 + 69 + 31 + 64
= ( 36 + 64 ) + ( 69 + 31 )
= 100 + 100
= 200
12 + 78 + 25 + 75
= (12 + 78 ) + ( 25 + 75 )
= 90 + 100
= 190
\(a,-55.78+13\left(-78\right)-78.\left(-65\right)\)
\(=78\left(-55-13+65\right)\)
\(=78.\left(-3\right)\)
\(=-234\)
\(b,45\left(-24\right)+\left(-10\right).\left(-12\right)\)
\(=-90.\left(-12\right)+\left(-10\right).\left(-12\right)\)
\(=-12\left(-90-10\right)\)
\(=-12.\left(-100\right)\)
\(=1200\)
a) \(-55.78+13.\left(-78\right)-78.\left(-65\right)\)
\(=\left(55+13-65\right).\left(-78\right)\)
\(=-234\)
b) \(45.\left(-24\right)+\left(-10\right).\left(-12\right)\)
\(=45.\left(-24\right)+\left(-10\right):2.2.\left(-12\right)\)
\(=45.\left(-24\right)+\left(-5\right).\left(-24\right)\)
\(=\left(-24\right).\left(45-5\right)\)
\(=-960\)
a, =78(32+24+18-75)-28(75+68-144)=78*(-1)-28*(-1)=-78+28=-50
câu b: a,b có là số nguyên không vậy
a.
78 . 32 +78 . 24+78.18-78.75 -28.75-28.68+28.144
= 78.(32+24+18-75)+28.( - 75-68+144)
=78.-1 + 28.1
=-78 + 28
=-50
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