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\(A=\left(6+5\right)^2\times5^2:5^3+\left(7-2\right)^9:5^8\)
\(=11^2\times25:125+5^9:5^8\)
\(=121\times25:125+5\)
\(=3025:125+5\)
\(=24,2+5\)
\(=29,2\)
A= (6+5)2 x 52 : 53 + (7-2)9 : 58
= 112 x 52 : 53 + 59 : 58
= (112 x 52)/53 + 59-8
= 112/5 + 5
= 121/5 +5
= 24 + 1/5 +5
= 29 + 1/5
=29,2
Vậy A=29,2
= (-123) x (-25) - 123 x 89 + 123 x 89 - 123 x 125
= 123 x 25 - 123 x 89 + 123 x 89 - 123 x 125
= 123 x (25 - 125) - (123 x 89 - 123 x 89)
= 123 x (-100) - 0
= -12 300
\(\left(4x-2\right)\left(x+5\right)=0\)
\(\Leftrightarrow\orbr{\begin{cases}4x-2=0\\x+5=0\end{cases}}\)
\(TH1:4x-2=0\)
\(\Leftrightarrow4x=0+2\)
\(\Leftrightarrow4x=2\)( loại vì x \(\in\) Z )
\(TH2:x+5=0\)
\(\Leftrightarrow x=0-5\)
\(\Leftrightarrow x=-5\)
Vậy x = - 5
a) 341 . 67 + 341 . 16 + 659 . 83
= 341 . (67 + 16) + 659 . 83
= 341 . 83 + 659 . 83
= 83 .( 341+659)
= 83 . 1000 = 83000
b) 42 .53+ 47 . 156 -47 . 114
= 42 . 53 + 47. ( 156 -114)
=42 . 53 + 47 . 42
= 42 .(53 +47)
= 42 .100 =4200
a, \(341.67+341.16+659.83\)
\(=341\left(67+16\right)+659.83\)
\(=341.83+659.83\)
\(=83\left(341+659\right)\)
\(=83.1000=83000\)
b, \(42.53+47.156-47.114\)
\(=42.53+47\left(156-114\right)\)
\(=42.53+47.42\)
\(=42\left(53+47\right)\)
\(=42.100=4200\)
Chúc bạn học tốt!
a ) 13 . 35 + 13 . 67 - 26
= 13 . ( 35 + 67 ) - 26
= 13 . 102 - 26
= 1326 - 26
= 1300
b) ( 25 .12 + 4 . 25 ) : 27
= [ 25 . ( 12 + 4 ) ] : 27
= 25 . 16 : 27
= 25 . 24 : 27
= 29 : 27
= 22 = 4
c) 23 . [ 50 - ( 17 - 54 : 33 )] + 16
= 8 . [ 50 - ( 17 - 54 : 27 )] + 16
= 8 . [ 50 - ( 17 - 2 )] + 16
= 8 . [ 50 - 15 ] + 16
= 8 . 35 + 16
= 280 + 16
= 296
K MK NHA
a) \(5^2.13^2+4.75-25.165\)
\(=25.169+300-4125\)
\(=4225+300-4125\)
\(=\left(4225-4125\right)+300\)
\(=100+300\)
\(=400\)
Ta có : 52 . 132 + 4 . 75 - 25 . 165
= ( 5 . 13 ) . ( 5 . 13 ) + 4 . 3 . 25 - 25 . 165
= 65 . 65 + 12 . 25 - 25 . 165
= 652 - 25 . 165 + 12 .25
= 4225 - 3825 = 400