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\(a,x:\left(111-99\right)=17\cdot5\\ \Leftrightarrow x:12=85\\ \Leftrightarrow x=1020\\ b,\left(509+335\right):x=840:35\\ \Leftrightarrow844:x=24\\ \Leftrightarrow x=\dfrac{211}{6}\\ c,\left(x+1\right)+\left(x+2\right)+...+\left(x+28\right)=462\\ \Leftrightarrow28x+406=462\\ \Leftrightarrow28x=56\\ \Leftrightarrow x=2\)
d, 890 : x = 35 dư 15
\(\Rightarrow35x+15=890\\ \Leftrightarrow35x=875\\ \Leftrightarrow x=25\)
1) \(\Rightarrow5x-36=216\)
\(\Rightarrow5x=252\Rightarrow x=\dfrac{252}{5}\)
2) \(\Rightarrow\left[{}\begin{matrix}x-890=0\\74-x=0\end{matrix}\right.\)\(\Rightarrow\left[{}\begin{matrix}x=890\\x=74\end{matrix}\right.\)
(5x-36):18=12
5x-36=216
5x=252
x=50,4
(x-890)(74-x)=0
=> x-890=0 hoặc 74-x=0
x=890 hoặc x=74
a) \(3\left(x-5\right)+6=36\)
\(\Rightarrow3\cdot\left(x-5\right)=36-6\)
\(\Rightarrow3\cdot\left(x-5\right)=30\)
\(\Rightarrow x-5=10\)
\(\Rightarrow x=10+5\)
\(\Rightarrow x=15\)
b) \(200-8\cdot\left(x+7\right)=24\)
\(\Rightarrow8\cdot\left(x+7\right)=200-24\)
\(\Rightarrow8\cdot\left(x+7\right)=176\)
\(\Rightarrow x+7=\dfrac{176}{8}\)
\(\Rightarrow x+7=22\)
\(\Rightarrow x=22-7\)
\(\Rightarrow x=15\)
c) \(\left(x-890\right)\left(74-x\right)=0\)
+) \(x-890=0\)
\(\Rightarrow x=890\)
+) \(74-x=0\)
\(\Rightarrow x=74\)
d) \(\left(31-x\right)\cdot\left(x-64\right)=0\)
+) \(31-x=0\)
\(\Rightarrow x=31\)
+) \(x-64=0\)
\(\Rightarrow x=64\)
890 : x = 35 dư 15
x = (890 - 15) : 35
x = 25
1482 : x + 23 = 80
1482 : x = 80 - 23
1482 : x = 57
x = 1482 : 57
x = 26
15 - 5 x (x - 1 ) = 10
5 x ( x - 1 ) = 15 - 10
5 x (x - 1) = 5
x - 1 = 5 : 5
x - 1 = 1
x = 1 + 1
x = 2
6x - 5 = 613
6x = 613 + 5
6x = 618
x = 103
890 : x = 35 ( dư 15 )
x = ( 890 - 15 ) : 35
x = 25
1482 : x + 23 = 80
1483 : x = 80 - 23
1483 : x = 57
x = 1483 : 57
x = 26
15 - 5 x ( x - 1 ) = 10
5 x ( x - 1 ) = 15 - 10
5 x ( x - 1 ) = 5
x - 1 = 5 : 5
x - 1 = 1
x = 1 + 1
x = 2
6x - 5 = 613
6x = 613 + 5
6x = 118
x = 118
vi 890 : x = 35 du 15
nen 890 : x = 35 +15 hay 890 : x = 50
vay x = 890 : 50
x = 17.8
Ta có: 890:x=35 [dư 15]
[890-15] :x=35
875 : x = 35
x = 875:35
x = 25
Cho mình
câu 1
( 35+x) - 81 = 54
( 35+x) = 54+81
35+x = 135
x = 135 - 35
x = 100
= .....000000000000000000[18 chữ số 0]
max rảnh