旗杆高约15
字典厚约4
文具盒长约20
200厘米2米 3×54×3 95-1685
2×22+2 45-7 26+3 85-25+3080
28+12=
42-9=
4×2=
2×6+3=
15+30=
39-20=
3×5=
5×5-20=
①47+35=
②72-34=
③20+36+38=
④81-36-28=
⑤46+36-28=
⑥72-(38+16)=