294×25+6×25=(+)×25
458×6562×458 836÷22836÷19
9600000960万 2个直角的度数之和138度
6×7=42
66×67=4422
666×667-444222
6666×=
9×3.14= +÷= 36×= 728﹣299=
72÷0.4= 75×10%= 1÷×= 12.56÷6.28=
60÷80%= 75%+0.25= = =