1. Herbicides are examples of ______pollution__________ in agriculture. ( POLLUTE )
2. You mustn’t drink the water in rivers because it is ______clean__________ ( CLEAN )(sai)
3. The Canadians are native _____speakers___________ of English. ( SPEAK )
4. Paul ________has visited___________ the famous Sydney Opera House twice. ( VISIT )

=2

= 3-1

=4-2

=5-3

=6-4

=7-5

=8-6

=9-7

=10-8

=....................................................................................................................

2.3\(^x\)=10.3\(^{12}\)+8.3\(^{12}\)

2.3\(^x\)=3\(^{12}\).(10+8)

2.3\(^x\)=18 .3\(^{12}\)=2.3\(^2\).3\(^{12}\)=2.3\(^{14}\)

vậy x=14 

\(\frac{10}{100}\)của  \(\frac{2,5}{100}\)là :

\(\frac{10}{100}\)x \(\frac{2,5}{100}\)= \(\frac{25}{10000}\)= \(\frac{0,25}{100}\)= 0,25%