- = 2.4× = 56÷ = 0× = 2×20%=
15× = ÷7= 7- = 1÷ = 10÷10%=
×16= 12÷ = × = 0× + = ×4× =
1÷ = ÷ = ÷ = + × = × ÷ × =
18×-
37×+6.4×7.5-
2020×
+×
×99+
14×(+)×18
①12.7﹣3.6﹣5.4
②
③
④