A:①②③
B:①②③④
C:②③
D:①②④
遇到下列情况怎么办呢?
爷爷闷了:
奶奶病了:
脱式计算。
①721÷7×6
②(900-174)÷2
③243÷3+766
Do you know who is the owner of cat with white and yellow hair?