123123

23123

123123

12

12

1

x−32​=−125​

⇒x=−512+23⇒x=−125​+32​

⇒x=−512+812⇒x=−125​+128​

⇒x=312=14⇒x=123​=41​

$----$

x15=34+19−2015x​=43​+−2019​

⇒x15=−15⇒15x​=−51​

⇒−315=−15⇒−153​=−51​

$\Rightarrow x=-3$

$-----$

x−2=−8x−2x​=−x8​

⇒x2=−2.(−8)⇒x2=−2.(−8)

⇒x2=16⇒x2=16

⇒[x=4x=−4⇒[x=4x=−4​
 

a. (−27+47)+17=27+17=37(7−2​+74​)+71​=72​+71​=73​

b. (−819+2719)+(−421+−1721)+−1216=1919+−2121+−1216(19−8​+1927​)+(21−4​+21−17​)+16−12​=1919​+21−21​+16−12​

=1+(−1)+−1216=−1216=1+(−1)+16−12​=16−12​

c. −37+−1113+−213+37+1=(−37+37)+(−1113+−213)+1=0−1+1=07−3​+13−11​+13−2​+73​+1=(7−3​+73​)+(13−11​+13−2​)+1=0−1+1=0

2

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