- = 2.4× = 56÷ = 0× = 2×20%=
15× = ÷7= 7- = 1÷ = 10÷10%=
① × ×3
②87×
③ - ×
④ ÷ ×
⑤3.7× +1.3÷
⑥ ÷(3- - )