24×50=
14.3﹣4.03=
4.2×(-)=
:( )=
0.35÷0.7=
0.5×=
9÷3%+30%=
1﹣1÷1+1=
①1204+879+121
②74×60%+×25+0.6
③1.2÷×(0.6﹣)
④×[﹣(+)]