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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
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ta có : 1.1x 1.2 x 1.3 x y = y x 2,1 x 2,2 x 2,3
=> 1,716 x y = y x10,626
=> y= 0
Vậy y = 0
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0,25 X x = 0,75+0,25
0,25 X x = 1
x = 1:0,25
x = 4
x : 1.25 =1/4 - 0,25
x : 1,25 = 0,75
x = 0,75 x 1,25
x = 0,9375
0,25 X x = 0,75+0,25
0,25 X x = 1
x = 1:0,25
x = 4
0,25 x x = 0,75+0,25
0,25x x = 1
x = 1 : 0,25
x = 4
x : 1,25 =\(\frac{1}{4}\) - 0,25
x : 1,25 = \(\frac{1}{4}-\frac{25}{100}\)
x : 1,25 = \(\frac{1}{4}-\frac{1}{4}\)
x : 1,25 = 0
x = 0 x 1,25
x = 0
0,25 x x = 0,75+0,25
0,25x x = 1
x = 1 : 0,25
x = 4
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Ta có: \(x:1+x:0,5+x:0,25+x:1,25=60\)
\(\Rightarrow x.1+\frac{x.1}{2}+\frac{x.1}{4}+\frac{x.5}{4}=60\)
\(\Rightarrow x\left(1+\frac{1}{2}+\frac{1}{4}+\frac{5}{4}\right)\)\(=60\)
\(\Rightarrow x.3=60\)
\(\Rightarrow x=60:3=20\)
pham nguyet anh ! Tk For me ^_~!
Xin lỗi mình nhầm:
ta có : \(x.1+x.2+x.4+\frac{x.4}{5}=60\)
\(\Rightarrow x\left(1+2+4+\frac{4}{5}\right)=60\)
\(\Rightarrow x=60:\left(1+2+4+\frac{4}{5}\right)=60:\frac{39}{5}=\frac{100}{13}\)
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=>\(x\times4+x\times8+x\times2=1,4\)
\(\Rightarrow x\times\left(4+8+2\right)=1,4\)
\(\Rightarrow x\times14=1,4\)
\(\Rightarrow x=1,4\div14\)
\(\Rightarrow x=0,1\)
x : 0,25 + x : 0,125 + x : 0,5 = 1,4
x : ( 0,25 + 0,125 + 0,5 ) = 1,4
x : 0,875 = 1,4
x = 1,4 x 0,875
x = 1,225
Chúc bn hc tốt <3
5x-2x=6-7x
( 1.1 x 1.2 x 1.3 x 1.4 x 1.5 x 1.6 ) x ( 1.25 - 0.25 x 5 )
=( 1,1 x 1,2 x1,3 x1,4 x1,5 x1,6 ) x ( 1,25 - 1,25 )
=( 1.1x1,2 x1,3 x1,4 x1,5 x1,6 ) x 0
=0