①3.25×3.6+7.75×3.6﹣3.6
②9.9×25
③
④
2﹣30%= +25%= 4.23﹣23%= ×=
3+= 4×15%= = +50%=
6.7﹣2.3=
100÷0.1=
3.14×22=
3.6×=
350÷68≈
5x-= :=x: 7.2+4x=50
①65×98
②2.5×24×0.5
③( )×48
④ +[( ﹣ )× ]
0×5.16= 9.8+2.6= 502-399=
÷4= × = 20×5=