①--
②+(-)
③++
④-(-)
⑤-(-)+
⑥+-+
+ = 1- = + = - =
×0= ×9= × = × =
+ = 4× = - = ÷ = × =
2- = ÷ = × = ×0= ÷ =
① + ×
② ÷ ×
③( + + )×18
④7.5× +7.5×
⑤ -( - )
⑥ -( + )