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\(y+y:0,5+y:0,25=14\)
\(y\times\left(1+1:0,5+1:0,25\right)=14\)
\(y\times\left(1+2+4\right)=14\)
\(y\times7=14\)
\(y=14:7\)
\(y=2\)
Vậy: y = 2
Lời giải:
$8\times x+x=995-15:3$
$x\times (8+1)=995-5$
$x\times 9=990$
$x=990:9=110$
\(A=\dfrac{2}{1\times3}+\dfrac{2}{3\times5}+\dfrac{2}{5\times7}+...+\dfrac{2}{99\times101}\)
\(A=1-\dfrac{1}{3}+\dfrac{1}{3}-\dfrac{1}{5}+\dfrac{1}{5}-\dfrac{1}{7}+...+\dfrac{2}{99}-\dfrac{2}{101}\)
\(A=1-\left(\dfrac{1}{3}-\dfrac{1}{3}\right)-\left(\dfrac{1}{5}-\dfrac{1}{5}\right)-\left(\dfrac{1}{7}-\dfrac{1}{7}\right)-...-\left(\dfrac{1}{99}-\dfrac{1}{99}\right)-\dfrac{1}{101}\)
\(A=1-0-0-0-...-\dfrac{1}{101}\)
\(A=1-\dfrac{1}{101}\)
\(A=\dfrac{101}{101}-\dfrac{1}{101}\)
\(A=\dfrac{100}{101}\)
A=21×3+23×5+25×7+...+299×101�=21×3+23×5+25×7+...+299×101
A=1−13+13−15+15−17+...+299−2101�=1−13+13−15+15−17+...+299−2101
A=1−(13−13)−(15−15)−(17−17)−...−(199−199)−1101�=1−(13−13)−(15−15)−(17−17)−...−(199−199)−1101
A=1−0−0−0−...−1101�=1−0−0−0−...−1101
A=1−1101�=1−1101
A=101101−1101�=101101−1101
A=100101
\(372-y=816:8=102\)
\(y=372-102=270\)
`816 :(372-y)=8`
`372-y=816:8`
`372-y=102`
`y=372-102`
`y= 270`