c) 315 - (135 - x) = 215
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2,
a) \(315-\left(135-x\right)=215\)
\(\Rightarrow135-x=315-215\)
\(\Rightarrow135-x=100\)
\(\Rightarrow x=135-100\)
\(\Rightarrow x=35\)
b) \(x-320:32=25\cdot16\)
\(\Rightarrow x-10=5^2\cdot4^2\)
\(\Rightarrow x-10=20^2\)
\(\Rightarrow x-10=400\)
\(\Rightarrow x=410\)
c) \(3\cdot x-2018:2=23\)
\(=3\cdot x-1009=23\)
\(\Rightarrow3\cdot x=1032\)
\(\Rightarrow x=1032:3\)
\(\Rightarrow x=344\)
d) \(280-9\cdot x-x=80\)
\(\Rightarrow280-x\cdot\left(9+1\right)=80\)
\(\Rightarrow280-10\cdot x=80\)
\(\Rightarrow10\cdot x=280-80\)
\(\Rightarrow10\cdot x=200\)
\(\Rightarrow x=20\)
e) \(38\cdot x-12\cdot x-x\cdot16=40\)
\(\Rightarrow x\cdot\left(38-12-16\right)=40\)
\(\Rightarrow x\cdot10=40\)
\(\Rightarrow x=40:10\)
\(\Rightarrow x=4\)
C) x-135=315-450
X-135=-135
X=0
D) 346+(210-x)=556
X-210=346-556
X-210=-210
X=0
a ) x : 3 1 5 = 1 1 2 ⇒ x = 1 1 2 .3 1 5 = 3 2 . 16 5 = 24 5
b ) 2 2 5 : x = − 1 3 5 ⇒ x = 2 2 5 : − 1 3 5 = 12 5 : − 8 5 = − 3 2 .
a) 2316 + 115 = 2431
b) (-315)+ (-15) = -330
c) (-215)+215 = 0
d) (-200)+200 = 0