13×5= 6.7-2.3= 606÷6= 8.3+1.7=
+ = - = 102×5= +
27×3=
4800÷6=
56÷4=
50×16=
0.7+7=
30×40=
840÷4=
69+25=
50×40=
420÷7=
73-26=
8.4+0.2=
32-6=
450-90=
48×51≈
287÷9≈
①1204+879+121
②74×60%+×25+0.6
③1.2÷×(0.6﹣)
④×[﹣(+)]