80-30=
30+9=
58-40=
37+40=
22+28=
45+26=
43+25=
48-38=
59-3=
18+9=
59-11=
70-37=
45+26+18= 74-18+22= 81-38-27=
42+34=
38+20=
48-23=
51-21=
8+61=
25+11=
63-9=
76-32=
30+29=
67-30=
7+20=
80-37=
38-8=
24+8=
97-6=
7+25=
14+65=
55-23=
70+15=
32+18=
76-54=
49-46 =
33+16 =
86-80=
59﹣50=
46﹣16=
46+30=
55+8=
63﹣6=
58﹣8=
43+11=
47﹣25=
+38=40 -45=29 +26=83 72-=35
答:儿童口罩比成人口罩多( )盒
答:一共买了( )盒口罩