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\(x\cdot\left(1990+2000+2001\right)=99\cdot7-99\cdot4-99-99\cdot2\)
\(\Leftrightarrow x\cdot\left(1999+2000+2001\right)=99\cdot\left(7-4-1-2\right)\)
\(\Leftrightarrow x\cdot\left(1999+2000+2001\right)=99\cdot0\)
\(\Leftrightarrow x\cdot\left(1999+2000+2001\right)=0\)
\(\Rightarrow x=0\)
\(x\times\left(1999+2000+2001\right)=99\times7-99\times4-99-99\times2\)
\(x\times\left(1999+2000+2001\right)=99\times\left(7-4-1-2\right)\)
\(x\times\left(1999+2000+2001\right)=99\times0\)
\(x\times\left(1999+2000+2001\right)=0\)
\(\Rightarrow x=0\)
Vậy \(x=0\)
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x = 5 y = 36
( 18 / 21 + 3 / 21 ) + ( 19 / 32 + 13 / 32 ) + ( 75 / 100 + 1 / 4 )
= 1 + 1 + 1 = 3
2008/2009 > 2010/2011 ; 1999/2001 < 12/11 ;2007/2006> 2006/2007 ; 101/100 >100/101
1.
x = 5
y = 36
2.
( 18 / 21 + 3 / 21 ) + ( 19 / 32 + 13 / 32 ) + ( 75 / 100 + 1 / 4 ) = 1 + 1 + 1 = 3
3.
> ; < ; > ; >
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57x36+114x32-1999-2001
=57x36+57x2x32-(1999+2001)
=57x 36+57x64-4000
=57x(36+64)-4000
=57x100-4000
=5700-4000
=5300
57 × 36 + 114 × 32 - 1999 - 2001
= 57 × 36 + 57 × 2 × 32 - (1999 + 2001)
= 57 × 36 + 57 × 64 - 4000
= 57 × (36 + 64) - 4000
= 57 × 100 - 4000
= 5700 - 4000
= 1700
\(57\cdot36+114\cdot32-1999-2001\)
\(=57\cdot36+57\cdot64-4000\)
\(=57\cdot\left(36+64\right)-4000\)
\(=5700-4000=1700\)