+ = ﹣ = + = ﹣ =
15× = × = × = 48× =
1- =
2- =
y+7y= 3a﹣a= 34﹣18.2= 7.2÷6= 2.9×101﹣2.9=
4.4+5.6= 0.02×10= 0.25×16= 1﹣ = 9.6×8÷9.6×8=
63= 3÷0.01= + = 1- =
+ = - = 5+ = - =