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a) \(124+\left(118+x\right)=217\)
\(118+x=217-124\)
\(118+x=93\)
\(x=-25\)
vay \(x=-25\)
b) \(\left[\left(6x-72\right):2-84\right].28=5628\)
\(\left(6x-72\right):2-84=5628:28\)
\(\left(6x-72\right):2-84=201\)
\(\left(6x-72\right):2=201+84\)
\(\left(6x-72\right):2=285\)
\(6x-72=285.2\)
\(6x-72=570\)
\(6x=642\)
\(x=107\)
vay \(x-107\)
c) \(71.2-\left(2x+5\right).6=100\)
\(142-\left(2x+5\right).6=100\)
\(\left(2x+5\right).6=142-100\)
\(\left(2x+5\right).6=42\)
\(2x+5=7\)
\(2x=2\)
\(x=1\)
vay \(x=1\)
\(\dfrac{x-25-124}{2015}\) + \(\dfrac{x-124-2015}{25}\) + \(\dfrac{x-2015-25}{124}\) = 3
\(\dfrac{x-15-124}{2015}\) - 1 + \(\dfrac{x-124-2015}{25}\) - 1 + \(\dfrac{x-2015-25}{124}\) - 1 = 0
\(\dfrac{x-15-124-2015}{2015}\)+\(\dfrac{x-124-2015-25}{25}\)+\(\dfrac{x-2015-25-124}{124}\) = 0
\(\dfrac{x-\left(15+124+2015\right)}{2015}\)+\(\dfrac{x-\left(124+2015+25\right)}{25}\)+\(\dfrac{x-\left(2015+25+124\right)}{124}\) = 0
(\(x\) - 2164).(\(\dfrac{1}{2015}\)+\(\dfrac{1}{25}\)+\(\dfrac{1}{124}\)) = 0
\(x-2164\) = 0
\(x\) = 2164
25 : 0,1 = 250
48 : 0,01 = 4800
95 : 0,1 = 950
25 x 10 = 250
48 x 100 = 4800
72 : 0,01 = 7200
b) 11 : 0,25 = 44
32 : 0,5 = 64
75 : 0,5 = 150
11 x 4 = 44
32 x 2 = 64
125 : 0,25 = 500
se bang:
=123+124+125+126+127+128+129+6500
=(123+127)+(124+126)+(125+128)+(129+5600)
=250+250+253+5729
=(250+250)+(253+5729)
=500+5982
=6482
\(\frac{2125}{Y}-\frac{100}{Y}-\frac{25}{Y}=\frac{2125-100-25}{Y}=\frac{2000}{Y}\)
\(\left(x+268\right).137=48498\)
\(\Leftrightarrow x+268=48498:137\)
\(\Leftrightarrow x+268=354\)
\(\Leftrightarrow x=354-268\)
\(\Leftrightarrow x=86\)
b) \(\left(x+3217\right):215=348\)
\(\Leftrightarrow x+3217=348.215\)
\(\Leftrightarrow x+3217=74820\)
\(\Leftrightarrow x=74820-3217\)
\(\Leftrightarrow x=71603\)
c) \(\left(x-2048\right):145=246\)
\(\Leftrightarrow x-2048=246.145\)
\(\Leftrightarrow x-2048=35670\)
\(\Leftrightarrow x=35670+2048\)
\(\Leftrightarrow x=37718\)
d) \(\left(2043-x\right).84=132552\)
\(\Leftrightarrow2043-x=132552:84\)
\(\Leftrightarrow2043-x=1578\)
\(\Leftrightarrow x=2043-1578\)
\(\Leftrightarrow x=465\)
e) \(x.124+5276=48304\)
\(\Leftrightarrow x.124=48304-5275\)
\(\Leftrightarrow x.124=43028\)
\(\Leftrightarrow x=43028:124\)
\(\Leftrightarrow x=347\)
\(\Leftrightarrow2043-x=1578\)
a) ( x + 268 ) x 137 = 48498
( x + 268 ) = 48498
x + 268 = 354
x = 354 - 268
x = 86