Solution: Known (a-2)? +|b- 1|=0
Then (a-2)? =0 |b- 1|=0
Then a=2 b= 1
Algebraic expressions 2a-3a? b+2ab？ -a？ b+3ab？ [Ancient names or Latin modern names of animals and plants]
=a-4a？ b+5ab？
Substitute a=2 b= 1 into a-4a? b+5ab？
a-4a？ b+5ab？
=2-4*2? * 1+5*2* 1?
=2- 16+ 10
=-4
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