①
②(840÷35﹣18)×20
③2.32× +1.68÷0.6
④6÷( )
24×50=
14.3﹣4.03=
4.2×(-)=
:( )=
0.35÷0.7=
0.5×=
9÷3%+30%=
1﹣1÷1+1=
36×25%=
12.6÷3=
7.3﹣3=
23×489≈
9.1+0.09=
①7×(9.3﹣5.8)﹣3.5
②9×( - )×6
③4.79× +21%÷
④ ÷[( - )× ]
①6.4×2.5×1.25
②8.5×98%
③÷4+×
④×