fifty - twenty + thirty, twenty - ten + ten, thirty - eighty - fifty, ten - ninety - eighty, forty - twenty + twenty, sixty - thirty + thirty, seventy - ninety - twenty, eighty - sixty + twenty, ninety - fifty + forty, a hundred - fifty + fifty,

Maths

由
打印
嵌入

排行榜

视觉风格

选项

切换模板

恢复自动保存：？