September 2018 2 27 Report

Oblicz pole prostokąta, stosując wzór skróconego mnożenia.

a) 8= 10- 2, 12= 10+ 2

(10- 2) (10+2)= 10^2- 2^2= ...-...=...

b) 98=100-2, 102= 100+2

(100-...) (100+...)= 100^2- ...^2= ...-...=...

c) 380=...-..., 420= ...+...

(...-...) (...+...)= ...^2 - ...^2= ...-...=...

d) 470=...-..., 530=...+...

(...-...) (...+...)= ...^2- ...^2= ...-...=...


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