6.4-3.32=
578+298=
48×25%=
-=
1÷=
4÷=
12×2.5=
+=
4.35÷0.5=
302×8.89=
799×20=
57﹣30=
15×4=
4.2÷7=
39+71=
①48×( + ﹣ )
②5.2×102
③ ÷ ﹣ ÷25%
1.43+0.2×0.5+1.57
÷[×(+)]
(÷﹣÷7)÷
÷[×(﹣)]
①1408﹣716﹣327
②4.37×99+4.37
③
④
x
9
?
y
40
80