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3072 - X : 3 = 1564
X : 3 = 3072 - 1564
X : 3 = 1508
X = 1508 nhân 3
X = 4524
3072-x:3= 1564
x:3= 3072-1564
x:3= 1508
x = 1508 x 3
x = 4524
3072-x:3=1564
x:3=3072-1564
x:3=1508
x=1508x3
x=4524
P/s tham khảo nha
64<Xx3+X+X<69
64<X x 5 < 69
64:5<X<69:5
12,8<X<13,8
Vì X là số tự nhiên nên X=13
\(1245:x+64:x-35:x+26:x=100\\ \Rightarrow1245\times\dfrac{1}{x}+64\times\dfrac{1}{x}-35\times\dfrac{1}{x}+26\times\dfrac{1}{x}=100\\ \Rightarrow\left(1245+64-35+26\right)\times\dfrac{1}{x}=100\\ \Rightarrow1300\times\dfrac{1}{x}=100\\ \Rightarrow\dfrac{1}{x}=\dfrac{1}{13}\\ \Rightarrow x=13\)
\(x\times64-43\times x-x=1200\)
\(x\times64-43\times x-x\times1=1200\)
\(x\times\left(64-43-1\right)=1200\)
\(x\times20=1200\)
\(x=1200:20\)
\(x=60\)
\(x\times64-43\times x-x=1200\)
\(\Rightarrow x\times64-43\times x-x\times1=1200\)
\(\Rightarrow x\times\left(64-43-1\right)=1200\)
\(\Rightarrow x\times20=1200\)
\(\Rightarrow x=1200\div20\)
\(\Rightarrow x=60\)
`( 42 - x ) : 9 + 1 = 4`
`( 42 - x ) : 9 =4-1`
`( 42 - x ) : 9 =3`
`42-x=3xx9`
`42-x=27`
`x=42-27`
`x=15`
Vậy `=15`
`55 - 5 xx ( x + 1 ) = 20`
`5 xx ( x + 1 ) =55-20`
`5 xx ( x + 1 ) =35`
`x+1=35:5`
`x+1=7`
`x=7-1`
`x=6`
Vậy `x=6`
`164 - 64 : ( 12 + x ) = 160`
` 64 : ( 12 + x ) =164-160`
` 64 : ( 12 + x ) =4`
`12+x=64:4`
`12+x=16`
`x=16-12`
`x=2`
Vậy `x=2`
`@` `\text {Ans}`
`\downarrow`
`(42 - x) \div 9 + 1 = 4`
` (42 - x) \div 9 = 4 - 1`
` (42 - x) \div 9 = 3`
` 42 - x = 3 \times 9`
` 42 - x = 27`
` x = 42 - 27`
` x = 15`
______
`55 - 5 \times ( x + 1 ) = 20`
`5 \times (x+1) = 55 - 20`
`5 \times (x+1) = 35`
`x + 1 = 35 \div 5`
`x + 1 = 7`
`x = 7 - 1`
`x = 6`
______
`164 - 64 \div ( 12 + x ) = 160`
`64 \div (12 + x) = 164 - 160`
`64 \div (12 + x) = 4`
`12 + x = 64 \div 4`
`12 + x = 16`
`x = 16 - 12`
`x = 4`
`@` `\text {Kaizuu lv uuu}`
A = \(\dfrac{5}{3}\) + \(\dfrac{5}{12}\) + \(\dfrac{5}{48}\) +......+ \(\dfrac{5}{768}\) + \(\dfrac{5}{3072}\)
4\(\times\)A = \(\dfrac{20}{3}\) + \(\dfrac{5}{3}\) + \(\dfrac{5}{12}\) + \(\dfrac{5}{48}\)+........+ \(\dfrac{5}{768}\)
4\(\times\) A - A = \(\dfrac{20}{3}\) - \(\dfrac{5}{3072}\)
3A = \(\dfrac{6855}{1024}\)
A = \(\dfrac{6855}{1024}\) : 3
A = \(\dfrac{2275}{1024}\)
3072 * x : 3 = 64
3072 * x = 64 * 3
3072 * x = 192
x = 192 : 3072
x = 0,0625.
Vậy x = 0,0625.
16?
?16