\(a,4,8\times0,25\times0,4\times0,02\)
\(=\left(4,8\times0,02\right)\times\left(0,25\times0,4\right)\)
\(=0,096\times0,1\)
\(=0,0096\)
\(b,12,5\times15,32\times0,008+15,32\times0,9\)
\(=\left(12,5\times0,008\right)\times15,32+15,32\times0,9\)
\(=0,1\times15,32+15,32\times0,9\)
\(=15,32\times\left(0,1+0,9\right)\)
\(=15,32\times1\)
\(=15,32\)
\(c,1,25\times0,52\times0,4\times0,8\times0,25\times1,2\)
\(=\left(1,25\times0,8\right)\times\left(0,4\times0,25\right)\times\left(0,52\times1,2\right)\)
\(=1\times0,1\times0,624\)
\(=0,0624\)
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