Спростіть вираз:
2,5*(4а-8b)-(3a-4b)*1,4
2,5*(4а-8b)-(3a-4b)*1,4=
10а-20b-4,2a+5,6b=5,8a-14,4b
=(10а-20b)-(4,2a-5,6b)=
=(10a*4,2a-10a*5,6b)-(20b*4,2a-20b*5,6b)=
=(42aa-56ab)-(84ab-112bb)=
=42aa-56ab-84ab+112bb=
=42aa+112bb-56ab-84ab=
=42aa+112bb-140ab<=>42 (а)квадрат + 122 (b) квадрат - 140ab
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Answers & Comments
2,5*(4а-8b)-(3a-4b)*1,4=
10а-20b-4,2a+5,6b=5,8a-14,4b
2,5*(4а-8b)-(3a-4b)*1,4=
=(10а-20b)-(4,2a-5,6b)=
=(10a*4,2a-10a*5,6b)-(20b*4,2a-20b*5,6b)=
=(42aa-56ab)-(84ab-112bb)=
=42aa-56ab-84ab+112bb=
=42aa+112bb-56ab-84ab=
=42aa+112bb-140ab<=>42 (а)квадрат + 122 (b) квадрат - 140ab