①48+37=
②74-28=
③90-49=
④32+23+18=
⑤56-(55-37)=
⑥68+29-22=
90-54=
38+44=
90-47=
37+46-54=
86-(52-28)=
14+36+17=
32+18-17=
37-18+13=
87-15-23=
5×2=
4×3=
7×4=
4×4=
2×8=
3×3=
2×9=
3×2=
3×8=
5×7=
8×4=
9×3=
5×9=
8×5=
6×4=
2×6=
①58+29=
②71-32=
③64+18=
④48+52=
⑤90-76=
⑥72-18=
30++20=70 27+40+ =78 97-50-=28
-25-15=36 52+-11=45 76--7=53
2×0.8= 75﹣20= ×12= 42÷=
+= 1.5÷3= 501×100≈ ×0÷=