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=45:(390:(5*100-(125+49*5)
=45:(390:(500-(125+245)
=45:(390:(500-370)
=45:(390:130)
=45:3
=15
tick nhé
45 : ( 390 : ( 5 x 102 - ( 53 + 72 x 5 )))
=45 : ( 390 : ( 5 x 100 - ( 125+ 49 x 5 )))
=45 : ( 390 : ( 5 x 100 - (125+245)))
=45 : ( 390 : ( 5 x 100 - 370))
=45 : ( 390 : (500-370))
=45:(390:130)
=45:3
=15
a)2^2 × 3 -[(2 × 3 - 5 ) ^ 10 +8]÷3^2
=2^2 × 3 - [(6-5) ^10+8]÷3^2
= 2^2 × 3-[1^10+8]÷3^2
=2^2×3 - [1+8]÷3^2
= 2^2 × 3 - 9 ÷ 3^2
=4×3-9÷9
= 12-1
=11
b)(-5)+[(-12)-5]+(15-13)
=-5 + -17 + 2
=-12 + 2
= -10
a) 22 . 3 - [ ( 2 . 3 - 5 )10 + 8 ] : 32
= 4 . 3 - [ ( 6 - 5 )10 + 8 ] : 9
= 12 - ( 110 + 8 ) : 9
= 12 - ( 1 + 8 ) : 9
= 12 - 9 : 9
= 12 - 1
= 11
b) ( -5 ) + [ ( -12 ) - 5 ] + ( 15 - 13 )
= ( -5 ) + ( -17 ) + 2
= -( 5 + 17 ) + 2
= ( -22 ) +2
= -( 22 - 2 )
= -20
b/1.2.3.....2013 - 1.2.3....2012-1.2.3...20122
= (1.2.3...2012.2013-1.2.3...2012)-1.2.3...2012.2012
= 1.2.3...2012(2013-1-2012)
=1.2.3...2012.0=0
\(a,42.9-555+9.58=378-555+552\)
\(=345\)
\(b,92:\left(5+2.\left(13-10\right)^2\right)=92:\left(5+2.9\right)\)
\(=92:\left(5+18\right)\)
\(=92:23\)
\(=4\)
\(c,5^9:5^6-4^2.4=125-64\)
\(=61\)
a) 42 . 9 - 555 + 9 . 58
= 378 - 555 + 522
= ( - 177 ) + 522
= 345
b) 92 : [ 5 + 2 . ( 13 - 10 )2 ]
= 92 : [ 5 + 2 . 32 ]
= 92 : [ 5 + 2 . 9 ]
= 92 : [ 5 + 18 ]
= 92 : 23
= 4
c) 59 : 56 - 42 . 4
= 53 - 43
= 125 - 64
= 61
a) 2010 - 2000 : [486 - 2(72 - 6)]
= 2010 - 2000 : [486 - 2(49 - 6)]
= 2010 - 2000 : [486 - 2 . 43]
= 2010 - 2000 : [486 - 86]
= 2010 - 2000 : 400
= 2010 - 5
= 2005
b) 2345 - 1000 : [19 - 2(21 - 18)2 ]
= 2345 - 1000 : [19 - 2 . 32 ]
= 2345 - 1000 : [19 - 18]
= 2345 - 1000 : 1
= 2345 - 1000
= 1345
c) 128 - [68 + 8(37 - 35)2 ] : 4
= 128 - [68 + 8 . 22 ] : 4
= 128 - [68 + 32 ] : 4
= 128 - 100 : 4
= 128 - 25
= 103
d) 568 - {5[143 - (4 - 1)2 ] + 10} : 10
= 568 - {5[143 - 9 ] + 10} : 10
= 568 - {5 . 134 + 10 } : 10
= 658 - {670 + 10 } : 10
= 658 - 680 : 10
= 658 - 68
= 590
\(a,\left\{\left[\left(37+13\right):5\right]-45:5\right\}.7\)
\(=\left\{\left[50:5\right]-45:5\right\}.7\)
\(=\left\{10-45:5\right\}.7\)
\(=\left\{10-9\right\}.7\)
\(=1.7=7\)
còn câu b?