①5×(25+14)
②(80-15)÷5
③42÷3+56
④36+14×7
84×58=
10-2.2=
832 +4=
★28× 77=
7.9+8.3=
★936÷5=
20-3.8= 39×26= 424÷4= ☆857÷6=
直角三角形的面积是24cm2