x +74=85
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( x - 41 ) . 109 = 74 . 215 - 74 . 106
( x - 41 ) . 109 = 74 . ( 215 - 106 )
( x - 41 ) . 109 = 74 . 109
x - 41 = 74 . 109 : 109
x - 41 = 74
x = 74 + 41
x = 115
Vậy x = 115
=))
\(\left(x-41\right)\times109=74\times215-74\times106\)
\(\left(x-41\right)\times109=74\left(215-106\right)=74.109\)
Chia cả hai vế cho 109 \(\Rightarrow x-41=74\)
\(x=74-41=34\)
a 475 - ( 75 + 36 ) = 475 - 75 - 36
= 400 - 36
= 364
b 821 - 73 - 27 - 21
= ( 821 - 21 ) - ( 73 + 27 )
= 800 - 100
= 700
a ) 475 - ( 75 + 36 )
= 475 - ( 75 + 35 ) - 1
= ( 475 - 1 ) - 100
= 474 - 100 = 374
b ) 821 - 73 - 27 - 21
= ( 821 - 21 ) - ( 73 + 27 )
= 800 - 100
= 700
c ) \(\frac{37}{25}\div\frac{5}{4}\div\frac{74}{25}\)
\(=\frac{37\cdot2\cdot2\cdot25}{25\cdot5\cdot37\cdot2}\)
\(=\frac{2}{5}\)
7x(2+x)-7x(x+3)=74
7x(x+2)-7x(x+3)=74
7x2 + 14x - 7x2 - 21x = 74
14x - 21x = 74
-7x = 74
\(\frac{-7x}{-7}=\frac{74}{-7}\)
x = \(\frac{74}{-7}\)
\(7x\left(2+x\right)-7x\left(x+3\right)=74\)
\(\Leftrightarrow14x+7x^2-7x^2-21x=74\)
\(\Leftrightarrow-7x=74\Leftrightarrow x=-\frac{74}{7}\)
4 Can you tell me the way to the museum?
5 Her family is going to visit Huong in Can Tho this summer
6 How far is it from your house to Quynh coi Primary school?
7 In VN the new school year begins on September the fifth
(x+2)(x+3)-x(x+1)=34
VT=2(2x+3)
pt trở thành 2(2x+3)=34
4x+6=34
4x=28
x=7
Ta có : 10 + 11 + 12 + 13 + ... + x = 5106
=> [(x - 10) : 1 + 1] \(\times\) (x + 10)/2 = 5106
=> (x - 9) \(\times\) (x + 10) = 10212
=> \(x\times x+10\times x-9\times x-9\times10=10212\)
=> \(x\times x+x=10312\)
=> \(x\times\left(x+1\right)=10312\Leftrightarrow x\times\left(x+1\right)=101\times102\)
=> x = 101
Vậy x = 101
X=85-74
X=11
x= 85-74
x= 11