( + )×28 +
=
999+1019= 48÷12.5%= 0.64:0.8=
51÷68= 3.7+6.63= 1-0.22=
633÷91≈ 0.72× =
18× =
①3.7× +6.3÷
②( - )×( + )
③101×
④ ÷[ ×(-)]
⑤7÷ - ÷7
⑥ ÷[( + )÷ ]