英语课上老师教了12个单词，兰兰记住了8个，忘了多少个单词？7A2@:V(x2q*I8|5\9B9M;A
算式：提示+u5W*Z-m/U6I3?;H1t3P0n1i.Q7A2@:V(x2q*I8|5\9B9M;A
答：忘了3I2d7X1k7V6C/I个单词。7A2@:V(x2q*I8|5\9B9M;A