52+3425+43 60-1560-51
36+23= 45+27= 36+64=
78-26= 62-33= 50-39=
25+17+48= 81-36-22= 37+43-35=
86-▢=43 ▢ -23=34 39+▢=75 ▢-32=26
答:儿童口罩比成人口罩多( )盒
答:一共买了( )盒口罩