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921-(7x100+8x10)...​

Răspuns :

921 - ( 7 × 100 + 8 × 10 ) =

921 - ( 700 + 80 ) =

921 - 780 = 141

921-(7×100+8×10)=x

7×100=700

8×10=80

700+80=780

921-780=x

x=921-780

x=141

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