`A = 1/6 + 1/12 + 1/20 + 1/30 + .... + 1/19900`
`A = 1/( 2 xx 3 ) + 1/( 3 xx 4 ) + 1/( 4 xx 5 ) + 1/( 5 xx 6 ) + .... + 1/( 99 xx 100 )`
`A = 1/2 - 1/3 + 1/3 - 1/4 + 1/4 - 1/5 + 1/5 - 1/6 + .... + 1/99 - 1/100`
`A = 1/2 - 1/100`
`A = 49/100`
`**` Công thức `: a/( n xx ( a + n ) ) = a/n - a/( a + n )`
`A = 1/6 + 1/12 + 1/20 + 1/30 + ... + 1/9900`
`A = 1/(2×3) + 1/(3×4) + 1/(4×5) + 1/(5×6) + ... + 1/(99×100)`
`A = 1/2 - 1/3 + 1/3 - 1/4 + 1/4 - 1/5 + 1/5 - 1/6 + ... + 1/99 - 1/100`
`A = 50/100 - 1/100`
Help me. Hứa vote 5 sao, cám ơn
Vẽ mầm ko cảm xúc again NL : Hóng hộ dưới bl
giúp e 9 câu trắc nhiệm này với
13. Phân tích đa thức thành nhân tử b) $4x^{2}-4x-3$ c) $4x^{2}+4x-1$ d) $x^{2}-4xy-5y^{2}$
1.been/have/goods/the/2000/supplized/that/company/since/by 2.company/twenty/worked/father/years/for/for/my/has/this
giải pt sau với x là ẩn , a,b,c là tham số $\frac{a+b-x}{c}$ + $\frac{b+c-x}{a}$ + $\frac{c+a-x}{b}$ + $\frac{4x}{a+b+c}$ = 1
Mn giúp mik nha, mik đag cần gấp
His interest is English. (He is ...) _________________________________________ 42 They take part in outdoor activities. (participate) _________________________________________ 43 He takes care of sick children. (look after) _________________________________________ 44 They take part in playing marbles. (join in) _________________________________________ 45 Let's go to the zoo. (How about ...?) _________________________________________ 46 Let's go swimming. (What about...?) _________________________________________ 47 Let's play chess tonight. (Why...?) _________________________________________ 48 Why don't you listen to music? (Let's ...) _________________________________________ 49 Would you like to go to the cinema with me tonight? (How about..?) _________________________________________ 50 How about going by car? (Let's ...)
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5.4 mũ 15 .9 mũ 9 - 4.3 mũ 20 .8 mũ 9 và B = 5.2 mũ 9 .6 mũ 19 - 7.2 mũ 29 .27 mũ 6 .Tính A : B = ?
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