一个九位数,最高位是7,个级上都是0,其他数位上都是6,这个数是____,改写成以“万”为单位的数是____,省略万位后面的尾数是____,精确到亿位大约是____。
—Why are you looking for Mary in a hurry, John?
—The boss is wondering where she _____ and how long she ______ there.
由幂函数y=x12和幂函数y=x3图象围成的封闭图形面积为( )