Quay lại đáp án

	3	thêm 2 ký tự trong đáp án		Sửa 01-04-16 08:58 PM ๖ۣۜTQT☾♋☽ 1
ta có$:A=1(2+1)+2(3+1)+3(4+1)+.....+99(100+1)$$A=1.2+1+2.3+2+3.4+3+....+99.100+99$$A=(1.2+2.3+3.4+...+99.100)+(1+2+3+...+99)=333300+4950=338250$ ta có$:A=1(2+1)+2(3+1)+3(4+1)+.....+99(100+1)$$A=1.2+1+2.3+2+3.4+3+....+99.100+99$$A=(1.2+2.3+3.4+...+99.100)+(1+2+3+.+99)=333300+4950=338250$ ta có$:A=1(2+1)+2(3+1)+3(4+1)+.....+99(100+1)$$A=1.2+1+2.3+2+3.4+3+....+99.100+99$$A=(1.2+2.3+3.4+...+99.100)+(1+2+3+...+99)=333300+4950=338250$

	2	thêm 2 ký tự trong đáp án		Sửa 01-04-16 08:58 PM ๖ۣۜTQT☾♋☽ 1
ta có$:A=1(2+1)+2(3+1)+3(4+1)+.....+99(100+1)$$A=1.2+1+2.3+2+3.4+3+....+99.100+99$$A=(1.2+2.3+3.4+...+99.100)+(1+2+3+.+99)=333300+4950=338250$ ta có:A=1(2+1)+2(3+1)+3(4+1)+.....+99(100+1)$A=1.2+1+2.3+2+3.4+3+....+99.100+99$$A=(1.2+2.3+3.4+...+99.100)+(1+2+3+.+99)=333300+4950=338250$ ta có$:A=1(2+1)+2(3+1)+3(4+1)+.....+99(100+1)$$A=1.2+1+2.3+2+3.4+3+....+99.100+99$$A=(1.2+2.3+3.4+...+99.100)+(1+2+3+.+99)=333300+4950=338250$

	1	tạo mới		Trả lời 01-04-16 08:57 PM ๖ۣۜTQT☾♋☽ 1
ta có:A=1(2+1)+2(3+1)+3(4+1)+.....+99(100+1)$A=1.2+1+2.3+2+3.4+3+....+99.100+99$$A=(1.2+2.3+3.4+...+99.100)+(1+2+3+.+99)=333300+4950=338250$

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