口算(一)200+18056+125=400-70=71+28=6X8=36-18=35三5=90+150=78三9=45-27=720-180=9X9=910-90=38三7二220+150=6X9=6X7=40三8二290-40=770-160=600+270=620+150=3X7=7X7=37三6=56三9=760+100=750+125=4X6=19三8二200+50=430+27=720-70=820-128=33-17=71-43=81三9=72三8=71-24=250-60=28三7=33三6二66三8=5X5=15+43=58-36=6X6=60+350=840+90=5X9=43三7=460-72=34+23=34+56=13三6二9X4=30+540=620-57=11三5=67-53=口算(二)52+81=9X9=83三9二330-172=38+52=5X6=8X6=62+52=41三5=75+75=70+18=5X4=72-24=36三6二58+14=70-18=78-23=900-80=70+450=36三7二44三6二94-46=7X8=8X7=52三7二6X4=500+700=30+38=84-12=4X4=2X2=2300-500=44+23=7X2=520-30=980-400=6X3=750+60=8X1=8X2=17三5二8X3=26三6二300+70=760-500=38三7=700-300=270-80=7X3=22三7二100-45=8X4=2X6=9X6=33三6二370-230=69+30=32三4二1X1=120-30=5X4=口算(三)200+90=69+40=9X2=6X3=26+36=19+47=67三8二64三8二220+170=4X7=19三6二21-4-6=69+32=680-120=770+630=3X3=2