99.99×7+37×11.11-99.99÷0.1
=11.11×9×7+37×11.11-11.11×9÷0.1
=（63+37）×11.11-11.11×9÷0.1
=100×11.11-9×11.11÷0.1
=11.11×（100-90）
=111.1