请展开查看知识点列表
78-33-27
=78-(33+27)
=78-60
=18
70-2= 28+68= 82-(9+42)= 87-26-39=
47+29= 6+57= 40-18= 65-56=
39+57-21= 52-(60-24)= 71-15-26= 91-58+17=
进入组卷