÷ = × = 12× = + × =
× = 5- = ×0= ÷ × =
① × ÷
② ×39×
③ ÷ ×
④ ÷ ÷
⑤ ÷ ×3
⑥15÷ ×
旗杆高12 一个教室大约占地70
汽车油箱容积50 一本数学书的体积约是150。
× ÷
× =