X-27=90
x=??
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`#040911`
`a)`
`27 \times 38 + 62 \times 27 - 27 \times 90`
`= 27 \times (38 + 62 - 90)`
`= 27 \times (100 - 90)`
`= 27 \times 10`
`= 270`
\(27\times38+62\times27-27\times90\)
\(=27\times\left(38+62-90\right)\)
\(=27\times\left(100-90\right)\)
\(=27\times10\)
\(=270\)
\(x=27.38+62.27-27.90\)
\(x=27.\left(38+62-90\right)\)
\(x=27.10\)
\(=270\)
a. \(\dfrac{x}{5}=\dfrac{8}{10}\)
\(\Rightarrow10x=8.5\)
\(\Rightarrow10x=40\)
\(\Rightarrow x=\dfrac{40}{10}=4\)
b. \(\dfrac{9}{x}=\dfrac{90}{100}\)
\(\Rightarrow9.100=90x\)
\(\Rightarrow900=90x\)
\(\Rightarrow x=\dfrac{900}{90}=10\)
c. \(17+\dfrac{x}{35}=\dfrac{5}{7}\)
\(\Rightarrow\dfrac{595+x}{35}=\dfrac{25}{35}\)
\(\Rightarrow595+x=25\)
\(\Rightarrow x=25-595=-570\)
d. \(x:\dfrac{5}{27}=\dfrac{2}{9}\)
\(\Rightarrow\dfrac{27x:5}{27}=\dfrac{6}{27}\)
\(\Rightarrow27x:5=6\)
\(\Rightarrow27x=5.6\)
\(\Rightarrow27x=30\)
\(\Rightarrow x=\dfrac{30}{27}=\dfrac{10}{9}\approx1,11\)
27 x 38 + 62 x 37 + 27 x 90
\(=27\times\left(38+90\right)+62\times37\)
\(=27\times128+62\times37\)
\(=4356+2294\)
\(=6650\)
a) 15 + x + 27 + 53 = 201
=> x + ( 15 + 27 + 53 ) = 201
=> x + 95 = 201
=> x = 201 - 95
=> x = 106
Vậy x = 106
b) 50 * x + 20 617 = 80 617
=> 50 * x = 80 617 - 20 617
=> 50 * x = 60 000
=> x = 60 000 : 50
=> x = 1 200
Vậy x = 1 200
c) x * 25 + x * 35 = 90 * 360
=> x * ( 25 + 35 ) = 32 400
=> x * 60 = 32 400
=> x = 32 400 : 60
=> x = 540
Vậy x = 540
\(18-4\times\left(27-90+73\right):10\)
\(=18-4\times10:10\)
\(=18-4\)
\(=14\)
18 - 4 x ( 27 -90 + 73 ) : 10
= 18 -4 x 10 : 10
= 18 - 4
= 14
a) 43 x 27 + 43 x 13 + 43 x 68
= 43 x ( 27 + 13 + 68 )
= 43 x 108
= 43 x ( 100 + 8 )
= 43 x 100 + 43 x 8
= 4300 + 344
= 4644
b) 90 x 21 + 15 x 10 + 30 x 74
= 30 x 63 + 30 x 5 + 30 x 74
= 30 x ( 63 + 5 + 74 )
= 30 x 142
= 30 x ( 100 + 42 )
= 30 x 100 + 30 x 42
= 3000 + 1260
= 4260
x = 117
X = 90 +27
X= 117