A=200/14+200/35+200/65+……….+200/78209+200/79400 29/09/2021 Bởi Gianna A=200/14+200/35+200/65+……….+200/78209+200/79400
`A=200/14+200/35+200/65+……….+200/78209+200/79400` `⇒A=400(1/28+1/70+1/130+……….+1/156418+1/158800` `⇒A=400(1/4.7+1/7.10+1/10.13+……….+1/394.397+1/397.400)` `⇒3A=400(3/4.7+3/7.10+3/10.13+……….+3/394.397+3/397.400)` `⇒3A=400(1/4-1/7+1/7-1/10+1/10-1/13+……….+1/394-1/397+1/397-1/400)` `⇒3A=400(1/4-1/400)` `⇒3A=400.99/400` `⇒3A=99` `⇒A=33` Bình luận
Đáp án: Giải thích các bước giải: A=200/14+200/35+200/65+……….+200/78209+200/79400 A= 400/28+ 400/70+ 400/130+….+ 400/156418 + 400/158800 A= 400.( 1/28+ 1/70+….+ 1/158800) A= 400/3.( 3/4.7+ 3/7.10+…+ 3/397. 400) A= 400/3.( 1/4- 1/7+ 1/7- 1/10+…+ 1/397- 1/400) A= 400/3.( 1/4- 1/400) A= 400/3. 99/400 A= 99/3 A= 33 Vậy A= 33 Chúc bạn học tốt! Bình luận
`A=200/14+200/35+200/65+……….+200/78209+200/79400`
`⇒A=400(1/28+1/70+1/130+……….+1/156418+1/158800`
`⇒A=400(1/4.7+1/7.10+1/10.13+……….+1/394.397+1/397.400)`
`⇒3A=400(3/4.7+3/7.10+3/10.13+……….+3/394.397+3/397.400)`
`⇒3A=400(1/4-1/7+1/7-1/10+1/10-1/13+……….+1/394-1/397+1/397-1/400)`
`⇒3A=400(1/4-1/400)`
`⇒3A=400.99/400`
`⇒3A=99`
`⇒A=33`
Đáp án:
Giải thích các bước giải:
A=200/14+200/35+200/65+……….+200/78209+200/79400
A= 400/28+ 400/70+ 400/130+….+ 400/156418 + 400/158800
A= 400.( 1/28+ 1/70+….+ 1/158800)
A= 400/3.( 3/4.7+ 3/7.10+…+ 3/397. 400)
A= 400/3.( 1/4- 1/7+ 1/7- 1/10+…+ 1/397- 1/400)
A= 400/3.( 1/4- 1/400)
A= 400/3. 99/400
A= 99/3
A= 33
Vậy A= 33
Chúc bạn học tốt!