The glass drill bit is set with diamonds, not graphite, otherwise the glass will not be cut at all, and hydrochloric acid will also corrode iron.

You know there are about (500,000) pencil cases of this specification in the supermarket.

The area of a pencil box is 0.2*0.08=0.0 16 square meter.

The area of this football field is 8000 square meters.

8000÷0.0 16=500000

3.

(1+ root number 2)?

= 1+2 root number 2+2

=3+2 radical number 2

(3+2 radical number 2)?

=9+ 12 radical number 2+8

= 17+ 12 root number 2

Root number 2≈ 1.4 1

The integer part of 12 root number 2 is 16.

17+ 12 root 2 integer part 17+ 16=33