42.|x| = 84
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a. 37 x 5 -18 = 185 + 18 b. 42 : 6 + 84 = 7 + 84
= 167 = 91
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\(\left(x-35\right)\cdot42-84=0\)
\(\left(x-35\right)\cdot42=84\)
\(x-35=2\)
\(x=37\)
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a) 2070 + 414 x 4 x 28 - 138 x 3 x 17 = 41400
b) 2020 x 14 + 4040 x 16 + 6060 x 18 = 72720
c) 42 x 477 + 14 x 336 x 3 + 84 x 92 - 42 = 41832
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84 - 3.( x + 1 ) = 42
3.(x + 1 ) = 84 - 42
3 . ( x + 1 ) = 42
x + 1 = 42 : 3
x + 1 = 14
x = 14 - 1
x = 13
Vậy x = 13
\(84-3\left(x+1\right)=42\)
\(\Leftrightarrow84-3x-3=42\)
\(\Leftrightarrow81-3x=42\)
\(\Leftrightarrow3x=81-42\)
\(\Leftrightarrow3x=39\)
\(\Leftrightarrow x=13\)
vậy x=13
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42.|x|=84
=>x=84 hoặc x=-84
TH1:42.x=84
x=84:42
x=2
TH2 42.x=-84
x=(-84):42
x=-2
Vậy....