a) \(28.192+72.192+2022\)
\(=192.\left(28+72\right)+2022\)
\(=192.100+2022\)
\(=19200+2022\)
\(=21222\)
_________
d) \(6:\left\{400:\left[500-\left(125+25.7\right)\right]\right\}\)
\(=6:\left\{400:\left[500-300\right]\right\}\)
\(=6:\left\{400:200\right\}\)
\(=6:2\)
\(=3\)
\(#Wendy.Dang\)
\(c,28\cdot192+72\cdot192+2022\)
\(=192\cdot\left(28+72\right)+2022\)
\(=192\cdot100+2022\)
\(=19200+2022\)
\(=21222\)
\(d,6:\left\{400:\left[500-\left(125+25\cdot7\right)\right]\right\}\)
\(=6:\left\{400:\left[500-\left(125+175\right)\right]\right\}\)
\(=6:\left[400:\left(500-300\right)\right]\)
\(=6:\left(400:200\right)\)
\(=6:2\)
\(=3\)
#Toru