23÷45×910=
365+199= 40÷90= 0.8÷10%= 5.98+0.2= 2.5×400=
32 - 23 = 65 ÷ 56 = 1÷ 45 = 23 + 14 = 25 × 34 ÷ 25 × 34 =
914÷718×29 324÷[912×(518−16)]