开学庆典上，每个同学分7个气球，9个同学共需多少个气球？.~6A7B,d1@*C(W+j+E:g8d1F6F
算式：提示;Y0w-_)G3Q-z.S-Z5T(R.~6A7B,d1@*C(W+j+E:g8d1F6F
口答：9个同学共需;Q0Q,x.`0^4p*N*P个气球。.~6A7B,d1@*C(W+j+E:g8d1F6F