66+6= 47+21= 65+11= 75-21=
95-14= 58-11= 46-19= 69+0=
59- ( ) =0 51+( )=71 ( )-3=43 61-( )=3
27+58= 9+66= 84-38= 90-3=
55+38= 66+14 = 63-36= 100-27=
34+36 = 100-77= 41-18=
66-31= 55-29= 62+15= 68-62=
99-29= 12+58= 56-41= 85-38=
45+34= 24+15= 81-8= 44+33=
答:儿童口罩比成人口罩多( )盒
答:一共买了( )盒口罩