填空0c7v({7}7v4A
6×3读作7e)y5Q,Q+]0H;r3c(_5?'y'S.{乘以+v0L:f3j*T)W,b/{.v)f5{'q7L*d(~'X，表示/D7^;\4S)B7K.W5i/T3w个/W*p)u)]1M*r-[连加。0c7v({7}7v4A
3×6读作;A)l(_*U,}1C6Q'k'A1s+`/]乘以3C:B,F+j2@4p1h.~:w4S7J，表示9h9M+|;F6i个*[8r5D(O*v9_9z,b5x9F连加。0c7v({7}7v4A