笔算:4.28+3.7= 12.53﹣9.67= 76×45=58×26= 1507÷8=
8-2= 6+2= 8-6=
6-3= 3+3= 7-5= 5+2=
9-4= 9-5= 4+5=
10-4= 10-6= 4+6=
5+2= 7-5= 7-2=