Toán cho 1^2+2^2+ 3^2+………..10^2=385 tính 2^2 +4^2+6^2+……….+20^2 12/09/2021 By Maria cho 1^2+2^2+ 3^2+………..10^2=385 tính 2^2 +4^2+6^2+……….+20^2
Đáp án: 2^2 +4^2+6^2+……….+20^2 = (1.2)^2+(2.2)^2+(3.2)^2+…+(10.2)^2 = 1^2.2^2+2^2.2^2+3^2.2^2+…10^2.2^2 = (1^2+2^2+ 3^2+………..10^2).2^2 = 385.4 = 1540 Trả lời
2^2 +4^2+6^2+……….+20^2 = (1.2)^2+(2.2)^2+(3.2)^2+…+(10.2)^2 = 1^2.2^2+2^2.2^2+3^2.2^2+…10^2.2^2 = (1^2+2^2+ 3^2+………..10^2).2^2 = 385.4 = 1540 Trả lời
Đáp án:
2^2 +4^2+6^2+……….+20^2
= (1.2)^2+(2.2)^2+(3.2)^2+…+(10.2)^2
= 1^2.2^2+2^2.2^2+3^2.2^2+…10^2.2^2
= (1^2+2^2+ 3^2+………..10^2).2^2
= 385.4
= 1540
2^2 +4^2+6^2+……….+20^2
= (1.2)^2+(2.2)^2+(3.2)^2+…+(10.2)^2
= 1^2.2^2+2^2.2^2+3^2.2^2+…10^2.2^2
= (1^2+2^2+ 3^2+………..10^2).2^2
= 385.4
= 1540