14+49÷7=
51-6×7=
38+42-22=
72÷9+45=
20÷4+6=
18÷9+3=
44×2=
70×3=
68÷2=
630÷9=
13×7=
4×6-14=
①712-405=
②268×4=
③30.4元-8.7元=
40×25%= 1.03×10= 3×45= 1÷10%= 2.8×=
1.57﹣0.85= 0.49÷0.7= 3.05+6.2= 0.6:0.75= kg:40g=