A:A=2,Z='1'
B:A=2,Z='2'
C:A=3,Z='3'
D:A=3,Z=2
________ Gian ________ Tara are studying Chinese history now. They find it rich and amazing.
化简计算:(﹣a)6÷a3=____ ,a(a﹣1)﹣a2=____
I have _____eraser _____my pencil case.