Вычислите:
35^2-25^2 299∙301
(〖39,5〗^2-〖3,5〗^2)/(〖57,5〗^2-〖14,5〗^2 ) (〖3,3〗^3+〖6,7〗^3)/(〖3,3〗^2-3,3∙6,7+〖6,7〗^2 )
Вычислите:
(18^3-7^3)/(18^2+18∙7+7^2 )=
(783^3+517^3)/((783-517)^2+783∙517)=
(〖2,5〗^3-〖4,4〗^3)/1,9+〖2,5〗^2+〖4,4〗^2=
39,5^2-3,5^2=(39,5-3,5)*(39,5+3,5)=36*43
57,5^2–14,5^2=(57,5-14,5)*(57,5+14,5)=43*72
(39,5^2-3,5^2)/(57,5^2–14,5^2)=36/72=1/2=[b]0,5[/b]
3,3^3+6,7^3=(3,3+6,7)*(3,3^2-3,3*6,6+6,7^2)
(3,3^3+6,7^3)/(3,3^2-3,3*6,6+6,7^2)=3,3+6,7=[b]10[/b]
Вычислите:
(18^3–7^3)/(18^2+18∙7+7^2 )=18-7=[b]9[/b]
18^3–7^3=(18-7)*(18^2+18∙7+7^2 )
(783^3+517^3)/((783–517)^2+783∙517)=
783^3+517^3=(783+517)*(783^2-783*517+517^2)
(783–517)^2+783∙517=783^2-2*783*517+517^2+783∙517=783^2-783*517+517^2
(783^3+517^3)/((783–517)^2+783∙517)=783+517=[b]1300[/b]