POZIOMO:

$\text{b.}190+\underset{=100}{\underbrace{90+10}}-3=190+100-3=290-3=287$  

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$\text{d.}\underset{=10000}{\underbrace{1000+2000+3000+4000}}+66=10000+66=10066$  

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$\text{e.}\underset{=111}{\underbrace{333-222}}+101=111+101=212$  

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PIONOWO:

$\text{a.}\underset{=28000}{\underbrace{30000-2000}}+\underset{=10}{\underbrace{100-90}}=28000+10=28010$  

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$\text{b.}21+\underset{=120}{\underbrace{30+40+50}}+61=21+120+61=202$  

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$\text{c.}\underset{=800}{\underbrace{500+300}}-38=800-38=762$  

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KRZYŻÓWKA:

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HASŁO:

$\boxed{2}\boxed{8}\boxed{7}-\boxed{2}\boxed{1}\boxed{2}$