999+1019= 48÷12.5%= 0.64:0.8=
51÷68= 3.7+6.63= 1-0.22=
633÷91≈ 0.72× =
18× =
+ ×0= ÷ ÷ = × ÷ × = 0.32﹣0.22=
× = 1÷ = - = 0× =
+ = 1-25%= ÷ = × ÷ × =
1+2%= =
= = =
×4= 18÷ = × = 7- =
0× = 5.6× = 2÷40%= 1÷ ×1÷ =
① × ÷
②( ÷ +0.8)×
③ ÷7+ ×
④24×( + +25%)
⑤ +( + )×
⑥ ÷(5- - )