Mathematics
Senior High
｛a+(b+c)｝｛(b+c)a+bc｝から
(a+b+c)(ab+bc+ca)になるのなぜそうなるのか分かりません
至急教えてください!!!
お願いします( . .)"
ablatb) + bc{btc)+ Caleta) +3abc
abtab+bctbctCatca13abc
(64C)a+fb +013be)atbe Ebrc)
atCbtc)Hbtc)a thct
atbtc abtbctca)
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