小学三年级数学口算天天练4042=60X6=90049=28+56=700-300=51-23=2147=6347=600X8=78-29=80+120=5X60=12X8=36-19=120-24=1642=39+180=200X4=3943=20-14=4042=2147=4042=4042=54+46=660-600=47+56=600X8=26-16=30+56=25+17=6043=480-88=600046=130X3=120-27=3043=84+28=200X4=72-24=4044=20X3=58+69=18+27=32X3=72+18=51-26=6044=1X40=100X2=93-28=75+25=98-49=12X5=62+18=17X4=14X6二28+56=15X2=50-27=16X5=41-25=27+36=800X3=16X3=68+54=35-26=700-300=15X6=32X3=200^5二40三2二300X4=60+26=140X3=28+54=93-28=37+46=360-64=13X4=84+26=60三6二40三2二60X2=55+36=60+100=69+18=43-25=45+26=20X3=300X4=25+17=46-28=58+34=25+67=42三7二33三3二920X2=120X4=68三2二120X4=41X3=510X2=3X220=3X220=88三4二80三2二23X2=21X2=72三8二48三8二90三9二200X4=6X11=88三8二120X4=23X2=483-17=310X3=80三4二2X13=389+101=3X220=9999X1=389+101=700X7=88三8二99三9二554-231=80三2二0X144=700X7=8X200=890+210=987-123=6X11