小明在做家庭作业时发现练习册上一道解方程的题目被墨水污染了: ,“□”是被污染的数.他很着急,翻开书后面的答案,这道题的解是x=2,你能帮他补上“□”的数吗? 答案:解:设“□”的数为m,因为所给方程的解是x=2,所以 2+12−5×2−m3=−12 ,解得m=4,所以“□”的数为4.26、-Whose book is this? Is it Tom's?
-No, it's .
And is on the desk.
A.mine,
his B.I,
he C.my,
his D.me, him