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870 - x : 11 x 87 = 261
x : 11 x 87 = 870 - 261
x : 11 x 87 = 609
x : 11 = 609 : 87
x : 11 = 7
x = 7 x 11
x = 77
x : 0.25 x 2.3 = 6.9
x : 0.25 = 6.9 : 2.3
x : 0.25 = 3
x = 3 x 0.25
x = 0.75
2 x (y + y) = 8.16
y + y = 8.16 : 2
y x 2 = 4.08
y = 4.08 : 2
y = 2.04
y x 1.5 + y + y x 7.5 = 59.8
y x (1.5 + 1 + 7.5) = 59.8
y x 10 = 59.8
y = 59.8 : 10
y = 5.98
m : 1/6 + m : 0.25 = 152
m : 1/6 + m : 1/4 = 152
m x 6 + m x 4 = 152
m x (6 + 4) = 152
m x 10 = 152
m = 152 : 10
m = 15.2
m : 1/3 + m : 0.25 = 1.4
m : 1/3 + m : 1/4 = 1.4
m x 3 + m x 4 = 1.4
m x (3 + 4) = 1.4
m x 7 = 1.4
m = 1.4 : 7
m = 0.2
y + y + y : 0,5 + y : 0,25 + y : 0,125 = 15
y x 2 + y x 2 + y x 4 + y x 8 = 15
y x (2 + 2 + 4 + 8) = 15
y x 16 = 15
y = 15 : 16
y = 0,9375
k cho tớ nhé
y + y + y : 0.5 + y : 0.25 + y :0.125 = 15
yx2+yx1/2+yx1/4+yx1/8=15
yx(2+1/2+1/4+1/8)=15
yx23/8=15
y=15:23/8=120/23
y+y:0,5+y:0,25+y:0,125=15
y.1+y.2+y.4+y.8=15
y.(1+2+4+8)=15
y.15=15
y=15:15
y=1
\(y+y:0,5+y:0,25+y:0,125=15\)
\(y+y\cdot2+y\cdot4+y\cdot8=15\)
\(y\cdot\left(1+2+4+8\right)=15\)
\(y\cdot15\) \(=15\)
\(y=15:15\)
\(y=1\)
y + y : 0,5 + y : 0,25 + y + 0,125 = 15
=> y + y x 2 + y x 4 + y x 8 = 15
=> y x 1 + y x 2 + y x 4 + y x 8 = 15
=> y x (1 + 2 + 4 + 8) = 15
=> y x 15 = 15
=> y = 15 : 15
=> y = 1
Y : 0,5 + Y . 3 + Y : 0.25 = 1,2345
Y . 2 + Y . 3 + Y . 4 = 1,2345
Y . (2 + 3 + 4) = 1,2345
Y . 9 = 1,2345
Y = 1,2345 / 9
Y = 0,1371(6)
Vậy Y = 0,1371(6)
y : 1 + y : 0,25 + y : 0,125 = 15
y : ( 1 + 0,25 + 0,125 ) = 15
y : 1,375 = 15
y = 15 : 1,375
y=8
\(y:0,25+y:0,2+y=2019\)
\(y\times4+y\times5+y=2019\)
\(y\times\left(4+5+1\right)=2019\)
\(y\times10=2019\)
\(y=2019:10\)
\(y=201,9\)
\(y:\dfrac{1}{4}+y:\dfrac{1}{5}+y=2019\)
\(4xy+5xy+y=2019\)
\(10xy=2019\Rightarrow y=2019:10=201,9\)