问题 解答题 口算6×17=710×57=23×23=67+6=25×12=89×4=0.5-14=1445×1521= 答案 6×17=67,710×57=12,23×23=49.67+6=667,25×12=15,89×4=329,0.5-14=14,1445×1521=29.