a: =5,6(3,7+2,3)=5,6*6=33,6
b: =47,85(47-17)=47,85*30=1435,5
\(a,5,6\times3,7+5,6\times2,3\\ =5,6\times\left(3,7+2,3\right)\\ =5,6\times6\\ =33,6\\ b,47,85\times47-47,85\times17\\ =47,85\times\left(47-17\right)\\ =47,85\times30\\ =1435,5\)
a: =5,6(3,7+2,3)=5,6*6=33,6
b: =47,85(47-17)=47,85*30=1435,5a: =5,6(3,7+2,3)=5,6*6=33,6