(3924+72*264):64-104
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\(264-\left(3\times x+155\right)=64\)
\(3\times x+155=264-64\)
\(3\times x+155=200\)
\(3\times x=200-155\)
\(3\times x=45\)
\(x=\frac{45}{3}=15\)
264 - ( 3x + 155 ) = 64
3x + 155 = 264 - 64
3x + 155 = 200
3x = 200 - 155
3x = 45
x = 45 : 3
x = 15
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\(=\dfrac{\dfrac{1}{3}-\dfrac{1}{7}-\dfrac{1}{13}}{2.\left(\dfrac{1}{3}-\dfrac{1}{7}-\dfrac{1}{13}\right)}.\dfrac{3.\left(\dfrac{1}{4}-\dfrac{1}{16}-\dfrac{1}{64}-\dfrac{1}{264}\right)}{\dfrac{1}{4}-\dfrac{1}{16}-\dfrac{1}{64}-\dfrac{1}{264}}\)
\(=\dfrac{1}{2}.3=\dfrac{3}{2}\)
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a) `1/2 xx 5/4 + 1/2 xx 3/4 + 1/2`
`=1/2 xx (5/4 + 3/4 + 1)`
`=1/2 xx 3`
`=3/2`
b) `72/95 xx 64/72 xx 95/72 xx 14/86 xx 72/64 xx 86/14`
`=(72xx64xx95xx14xx72xx86)/(95xx72xx72xx86xx64xx14)`
`= 1`.
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6193 - [ 72 . ( x - 104 ) + 98 ] = 5807
72 . ( x - 104 ) + 98 = 6193 - 5807
72 . ( x - 104 ) + 98 = 386
72 . ( x - 104 ) = 386 - 98
72 . ( x - 104 ) = 288
x - 104 = 72 . 288
x - 104 = 20736
x = 20736 + 104
x = 20840
6193-[72.(x-104)+98]=5807
72.(x-104)+98=6193-5807
72.(x-104)+98=386
72.(x-104)=386-98
72.(x-104)=288
x-104=288.72
x-104=20736
x=20736+104
x=20840
-cho-mik-he