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a,(x-15).35=0(dấu chấm là nhân nhá)
x-15=0:35=0
x=0+15
x=15
a) 156 - ( x + 61 ) = 82
<=> x + 61 = 74
<=> x = 13
b ) x : ( 111 - 99 ) = 17 , 5
<=> x : 12 = 17 , 5
,=> x = 210
c) ( 509 + 355 ) : x = 840 : 35
<=> 864 : x = 24
,=> x = 36
a) 156 - ( x + 16 ) = 82 x : ( 111 - 99 ) = 17.5
x + 16 = 156 - 82 x : 12 = 17.5
x + 16 = 74 x = 17.5 x 12
x = 74 - 16 x = 210
x = 58 Vậy x = 210
Vậy x = 58
c) ( 509 + 355 ) : x = 840 : 35
864 : x = 840 : 35
864 : x = 24
x = 864 : 24
x = 36
Vậy x = 36
a) ( 509 + 355 ) : x = 840 : 35
864 : x = 24
x = 864 : 24
x = 36
b) 890 : x = 35 dư 15
=> 890 : x - 15 = 35
=> 890 : x = 35 + 15
=> 890 : x = 50
=> x = 17,8
A) ( 509 + 355 ): x = 840 : 35
= 864 : x = 24
x = 864 : 24
x = 36
B) 890 : x = 35 dư 15
x = 890 : 35
x = 25,428
a) ( x - 15 ) - 75 = 0
<=> x - 15 = 75
<=> x = 90
b) 575 - ( 6x + 70 ) = 445
<=> 6x + 70 = 130
<=> 6x = 60
<=> x = 10
c) 315 + ( 125 - x ) = 435
<=> 125 - x = 120
<=> x = 5
\(a,x:\left(111-99\right)=17\cdot5\\ \Leftrightarrow x:12=85\\ \Leftrightarrow x=1020\\ b,\left(509+335\right):x=840:35\\ \Leftrightarrow844:x=24\\ \Leftrightarrow x=\dfrac{211}{6}\\ c,\left(x+1\right)+\left(x+2\right)+...+\left(x+28\right)=462\\ \Leftrightarrow28x+406=462\\ \Leftrightarrow28x=56\\ \Leftrightarrow x=2\)
d, 890 : x = 35 dư 15
\(\Rightarrow35x+15=890\\ \Leftrightarrow35x=875\\ \Leftrightarrow x=25\)
a) x - 105 : 21 = 15
x - 5 = 15
=> x = 20
b) ( x - 105 ) : 21 = 15
x - 105 = 315
=> x = 420
c) 315 + ( 125 - x ) = 435
125 - x = 120
=> x = 5
a) \(315+\left(125-x\right)=435\)
\(\Leftrightarrow125-x=435-315\)
\(\Leftrightarrow125-x=120\)
\(\Leftrightarrow x=125-120\)
\(\Leftrightarrow x=5\)
b) \(x:41=32\)
\(\Leftrightarrow x=32\cdot41\)
\(\Leftrightarrow x=1312\)
c) \(\left(x-105\right):21=15\)
\(\Leftrightarrow x-105=15\cdot21\)
\(\Leftrightarrow x-105=315\)
\(\Leftrightarrow x=315+105\)
\(\Leftrightarrow x=420\)
d) \(x-105:21=15\)
\(\Leftrightarrow x-5=15\)
\(\Leftrightarrow x=15+5\)
\(\Leftrightarrow x=20\)
a, 315 + ( 125 - x ) = 435
( 125 - x) = 435 - 315
( 125 - x ) = 320
x = 320 - 125
x = 195
a,315+(125-x)=435
125-x=435-315
125-x=120
x=125-120
x=5
b,x:(111-99)=175
x:12=175
x=175.12
x=2100