第六单元家庭作业12+6=?? ?????29-7=???? ????33+2=???? ???3+40=????? 5+4=23+5=???? ???37+1=???? ????29-3=???? ??38-3=??????15-4= 18-2=??? ???30+8=????? ????43+1=???? ???86+2=?????70+3= 30-2=?? ????72-2=?? ???????66-4=?? ?????39-2=?? ? 20-9= 53+5=??? ???35+2=???? ?????39-4=???? ???8+50=???????20-1= 40+6=