Question

脫式計算，能簡便計算的要簡算。
13.6+1.4÷（18.2-17.8）
0.72÷[3.6×（0.51-0.49）]
10.01×12.6-12.6×0.01
10.9×3.23-3.23

Answer 1

13.6+1.4÷（18.2-17.8）
=13.6+1.4÷0.4
=13.6+3.5
=17.1
0.72÷[3.6×（0.51-0.49）]
=0.72÷[3.6×0.02]
=0.72÷0.072
=10
10.01×12.6-12.6×0.01
=126.126-0.126
=126
10.9×3.23-3.23
=35.207-3.23
=31.977