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a/ ta có : 5.(27-17)2 - 611 : 69 = 5.102 - 611 :69
= 5.100 - 611-9 = 500 - 36 = 464
b/ ta có : (-15)+(-17) = -15 - 17 = -32
c/ ta có : 21.42 + 21.59 +21.52 = 21.(42 +59 +52 )
= 21. (16 + 59 + 25) = 21.100=2100
d/ ta có : 75 - (3.52 - 4.23 ) +20150 = 75 - (3.25 - 4.8) +1
= 75 - 43 +1 = 33
a,\(3^3.3^2-3^5+5^8.1-5^{12}:5^4\)
=\(3^5-3^5+5^8-5^8\)
=0
9!-8!-7! :\(8^2\)
=8!.9-8!-8!.8
=8!.(9-1-8)
=8!.0
=0
a) 600:{300:[200 - (30 + 8.20)]}
= 600:{300:[200 - 190]}
= 600:{300 : 10}
= 600 : 30
= 20
b) 42.53 - (20150 + 8) : 32
= 16.125 - (1 + 8) : 9
= 2000 - 1
= 1999
c) 25.75 + 25.16 + 5.45
= 25.75 + 25.16 + 5.5.9
= 25.75 + 25.16 + 25.9
= 25.(75 + 16 + 9)
= 25.100
= 2500
c)
25.75+25.16+5.45
=25.75+25.16+5.(5.9)
=25.75+25.16+5.5.9
=25.75+25.16+25.9
=25.(75+16+9)
=25.100
=2500
a,113-3+20
=1328+20
=1348
b,300+7781+1425
=9506
c,7+36-40
=43-40=3
a,
115 : 112 - 33 : ( 11 + 23 ) + 22 x 30 x 5
= 11( 5 - 2 ) - 27 : ( 1 + 8 ) + 4 x 1 x 5
= 113 - 27 : 9 + 4 x 5
= 1331 - 3 + 20
= 1328 + 20
= 1348
b,
12 x 25 + 31 x 251 + 57x 25
= 12 x 25 + 57 x 25 + 31 x 251
= ( 12 + 57 ) x 25 + 31 x 251
= 69 x 25 + 31 x 251
= 1725 + 7781
= 9506
c,
15 - 23 + 4 x 32 - 5 x 8
= 15 - 8 + 4 x 9 - 40
= 15 - 8 + 36 - 40
= 7 + 36 - 40
= 43 - 40
= 3
\(3^3\cdot5^3-20\cdot\left\{300-\left[546-2^3\cdot\left(7^8-7^6+7^0\right)\right]\right\}\)
\(=3^3\cdot5^3-20\cdot\left\{300-\left[546-2^3\cdot5647153\right]\right\}\)
\(=3^3\cdot5^3-20\cdot\left\{300-\left[546-45177224\right]\right\}\)
\(=3^3\cdot5^3-20\cdot\left\{300--45176678\right\}\)
\(=3^3\cdot5^3-20\cdot45176978\)
\(=3375-903539560\)
\(=-903536185\)
\(626500:\left\{50^2:\left[178-4\cdot\left(35-21:3\right)\right]\right\}\)
\(=626500:\left\{50^2:\left[178-4\cdot\left(35-7\right)\right]\right\}\)
\(=626500:\left\{50^2:\left[178-4\cdot28\right]\right\}\)
\(=626500:\left\{50^2:\left[178-112\right]\right\}\)
\(=626500:\left\{50^2:66\right\}\)
\(=626500:\frac{1250}{33}\)
\(=\frac{82698}{5}\)
CHUC BAN HOC TOT >.<
a) 85 - ( 3 . 52 - 4 . 32 )
= 85 - ( 3 . 25 - 4 . 9 )
= 85 - ( 75 - 36 )
= 85 - 39
= 46
b) 9 . 23 - ( 711 : 72 + 12015 + 20160 )
= 72 - ( 79 + 12015 + 0 )
= 72 - 40353608
= - 40353536
c) 24 : { 390 : [ 500 - ( 53 + 49 . 5 )]}
= 24 : [ 390 : ( 500 - 370 ) ]
= 24 : ( 390 : 130 )
= 24 : 3
= 8
d) 2 + 4 + 6 + ... + 1000
Có số số hạng là:
( 1000 - 2 ) : 2 + 1 = 500 ( số )
Tổng là:
( 1000 + 2 ) . 500 : 2 = 250500
42 . 52 - ( 20150 + 8 ) : 32
= 16 . 25 - (1 + 8) : 9
= 16 . 25 - 9 : 9
= 16 . 25 - 1
= 400 -1
=399
\(=20^2-\left(1+8\right):3^2\)
\(=400-9:9\)
\(=400-1=399\)
k cho mình nha cảm ơn nhìu