\(44.179+20^2-79.44\\ =44\left(179-79\right)+400\\ =44.100+400\\ =100\left(44+4\right)=4800\\ 3.4^2:\left[500-\left(7.35+125\right)\right]\\ =3.16:\left[500-370\right]\\ =48:130=\dfrac{24}{65}\\ 187+\left[921-\left(921+887\right)\right]\\ =187+921-921-887\\ =187-887=-700\)
44. 179+ 202 - 79.44 3. 42 : [500- (7.35+125)]
= 44. 179+400 - 79.44 = 3. 16: [500- (245+125)]
= 44. (179-79) +400 = 48: [ 500-370 ]
= 44. 100+400 = 48:130
= 4400+400 = 0, 369...
= 4800
187+ [ 921-( 921+887) = 187+ [921- 1808]
= 187+ (-159)
= 28
\(a)44.179+20^2-79.44\)
\(=44.\left(179-79\right)+20^2\)
\(=44.100+400\)
\(=4400+400=4800\)
\(b)3.4^2:\left[500-\left(7.35+125\right)\right]\)
\(=3.4^2:\left[500-\left(245+125\right)\right]\)
\(=3.4^2:\left[500-370\right]\)
\(=3.16:130\)
\(=48:130=\dfrac{24}{65}\)
\(c)187+\left[921-\left(921+887\right)\right]\)
\(=187+\left[921-1808\right]\)
\(=187+\left[921-1808\right]\)
\(=187+\left(-887\right)\)
\(=-700\)