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987 654 321=32x172x379721
123 456 789=32x13717421
tick nhé
{123.456456} - {456.123123}
=56144088 - 56144088
0
CAU2
{98.7676 - 9898 . 76 } . {2001 . 2002 . 2003 ... 2010
={752248 - 752248 } . {2010 - 2001 + 1 = 10}
=0 . 10
=0
a) \(234+\left(345-x\right)=500\)
\(345-x=500-234\)
\(345-x=266\)
\(x=79\)
vay \(x=79\)
b) \(456-\left(x+23\right)=326\)
\(x+23=456-326\)
\(x+23=130\)
\(x=107\)
vay \(x=107\)
c) \(\left(5x-15\right):5=0\)
\(5x-15=0\)
\(5x=15\)
\(x=3\)
vay \(x=3\)
d) \(84-4\left(2x+1\right)=48\)
\(8x+4=84-48\)
\(8x+4=36\)
\(8x=32\)
\(x=4\)
vay \(x=4\)
e) \(\left(x-76\right).54=0\)
\(x-76=0\)
\(x=76\)
vay \(x=76\)
f) \(\left(x-3\right)\left(x+4\right)=0\)
\(\Rightarrow\orbr{\begin{cases}x-3=0\\x+4=0\end{cases}}\Rightarrow\orbr{\begin{cases}x=3\\x=-4\end{cases}}\)
vay \(\orbr{\begin{cases}x=3\\x=-4\end{cases}}\)
g) \(\left(x-6\right)\left(x-7\right)=0\)
\(\Rightarrow\orbr{\begin{cases}x-6=0\\x-7=0\end{cases}}\Rightarrow\orbr{\begin{cases}x=6\\x=7\end{cases}}\)
vay \(\orbr{\begin{cases}x=6\\x=7\end{cases}}\)
h) \(\left(x-2\right)\left(x-3\right)\left(x-5\right)=0\)
\(\Rightarrow x-2=0\Rightarrow x=2\)hoac \(\orbr{\begin{cases}x-3=0\\x-5=0\end{cases}\Rightarrow}\orbr{\begin{cases}x=3\\x=5\end{cases}}\)
vay \(x=2\)hoac \(\orbr{\begin{cases}x=3\\x=5\end{cases}}\)
a)(44x52x60):(11x13x15) =(44:11)x(52:13)x(60:15)=4x4x4 =64
\(a.\)
\(\left(44.52.60\right):\left(11.13.15\right)=\frac{44.52.60}{11.13.15}\frac{4.4.4\left(11.13.15\right)}{\left(11.13.15\right)}=4^3=64\)
A = [ -506 + 732 - ( -2000 )] - ( 506 - 1732 )
A = [ 226 - ( -2000 )] - ( 506 - 1732 )
A = 2226 - ( -1226 )
A = 3452
B = 38 + 41 + 117 + 159 + 62
B = ( 38 + 62 ) + (41 + 159) + 117
B = 100 + 200 + 117
B = 417
C = 73 + 86 + 968 + 914 + 3032
C = ( 86 + 914 ) + ( 968 + 3032 ) + 73
C = 1000 + 4000 + 73
C = 5073
D = 123 x 456456 - 456 x 123123
D = 123x456x1001-456x123x1001
D = 56088 x 1001 - 56088 x 1001
D = 1001x ( 56088 - 56088 )
D = 1001 x 0
D = 0
F = 1000 x ( 456 x 789789 -789 x 456456 )
F = 1000 x 0
F =0
654 - 2(x - 1) = 456 : 76
=> 654 - 2(x - 1) = 6
=> 2(x - 1) = 648
=> x - 1 = 324
=> x = 325
\(654-2\left(x-1\right)=456:76\)
\(654-2\left(x-1\right)=6\)
\(2\left(x-1\right)=654-6\)
\(2\left(x-1\right)=648\)
\(x-1=648:2\)
\(x-1=324\)
\(x=324+1\)
\(x=325\)
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