问题 口算题 直接写得数。50+28=40+20=67-27=24+42=34+21=30+29=38+20=7+32=69-40=90-40=43+35=60+40=24+4=38-6=5+32=33+6=76-3=8+80=100-80 0+55= 答案 78,60,40,66,55,59,58,39,29,50,78,100,28,32,37,39,73,88,20,55