324-(-24)+300=324+24+300=348+300=648

324 - ( - 24 ) + 300

= 324 + 24 + 300

= 348 + 300

= 648

-(24-36) + 112= - 24 + 36 + 112 = 12 + 112 = 124

324 + [112 - (112 + 324) - 320] = 324 + 112 -112 - 324 - 320

= 112 - 112 - 324 - 324 + 320

=0 - 0 + 320

= 320

\(\left(324.359+24\right):\left(137.10+357.322\right)\)

\(=\left(116316+24\right):\left(1370+114954\right)\)

\(=116340:116324\)

\(=\dfrac{29085}{29081}\)

cảm ơn bạn nha!

\(324-\left\{38+\left[7\cdot3-24:6+\left(9-7\right)^3\right]\right\}:15\)

\(=324-\left\{38+21-4+2^3\right\}:15\)

\(=324-\left\{38+17+8\right\}:15\)

\(=324-\dfrac{63}{15}=324-4,2=319,8\)

\(324+\left[1600-\left(4^3-18.3\right)^3\right]:6-\left|-24\right|\\ =324+\left[1600-\left(64-54\right)^3\right]:6-24\\ =324+\left(1600-10^3\right):6-24\\ =324+\left(1600-1000\right):6-24\\ =324+600:6-24\\ =324+100-24\\ =425-24\\ =400\)

+) \(24+\left(x-6\right)=135\)

\(\Rightarrow x-6=135-24=111\)

\(\Rightarrow x=111+6=117\)

+) \(2019-2\cdot\left(3x-2\right)=19\)

\(\Rightarrow2\cdot\left(3x-2\right)=2019-19=2000\)

\(\Rightarrow3x-2=2000:2=1000\)

\(\Rightarrow3x=1000+2=1002\)

\(\Rightarrow x=1002:3\)

\(\Rightarrow x=334\)

+) \(3^x+3^{x+1}=324\)

\(\Rightarrow3^x+3^x\cdot3=324\)

\(\Rightarrow3^x\cdot\left(1+3\right)=324\)

\(\Rightarrow3^x\cdot4=324\)                      \(\Rightarrow3^x=324:4=81\)

\(\Rightarrow3^x=3^4\)                           \(\Rightarrow x=4\)

Phần đầu

 = 324 : 27-(25-2.16)+1

=12-(25-32)+1

=12-(-7)+1

=12+7+1

=20

Phần sau tu lam