①345×73=
②※436÷42=
③37× 405=
④656÷82=
⑤68×170=
⑥※309÷43=
6.6×6.9=
6.66×66.9=
6.666×666.9=
6.6666×6666.9=
6.66666×66666.9=
2999.997÷9=
3999.996÷9=
4999.995÷9=
5999.994÷9=
6999.993÷9=