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輝念了崔遍匈 >> 3.14x2x4+3.14x2x3x3吉噐謹富 >>

3.14x2x4+3.14x2x3x3吉噐謹富

3.14x2x4+3.14x2x3x3吉噐謹富 3.14x2x4+3.14x2x3x3 =3.14〜8+3.14〜18 =25.12+56.52 =81.64

亟竃緩圭殻怏議奐鴻裳專喘兜吉佩延算栖盾 1 -1 1 -1 3 1 1 2 -3 1 1 3 3 -5 -1 及3佩受肇及2佩及2佩受肇及1佩 ゛ 1 -1 1 -1 3 0 2 1 -2 -2 0 2 1 -2 -2 及3佩受肇及2佩及2佩茅參2 ゛ 1 -1 1 -1 3 0 1 1/2 -1 -1 0 0 0 0 0 及1佩紗貧及2佩 ...

1/1*2+2/1*2*3+3/1*2*3*4+4/1*2*3*4*5+5/1*2*3*4*5*6+6/1*2*3*4*5*6*7 =1-1/1*2+1/1*2-1/1*2*3+1/1*2*3-1/1*2*3*4+1/1*2*3*4-1/1*2*3*4*5+1/1*2*3*4*5-1/1*2*3*4*5*6+61//1*2*3*4*5*6-1/1*2*3*4*5*6*7 =1-1/1*2*3*4*5*6*7 =1-1/5040 =5039/5040...

戻工匯倖宥喘圭隈 深賀匯違邉k遑k(k+1)(k+2)=k³+3k²+2k 1〜2〜3+2〜3〜4+...+n(n+1)(n+2) =(1³+2³+...+n³)+3(1²+2²+...+n²)+2(1+2+...+n) =[n(n+1)/2]²+3n(n+1)(2n+1)/6+2n(n+1)/2 =n²(n+1...

飛嗤音苧易散哭戻諒。

匯違議嗤 (n-1)n(n+1) =n^3-n {n^3}箔才巷塀Sn=[n(n+1)/2]^2 {n}箔才巷塀Sn=n(n+1)/2 1x2x3+2x3x4+3x4x5+....+7x8x9 =2^3-2+3^3-3+...+8^3-8 =(2^3+3^3+...+8^3)-(2+3+...+8) =[(8*9/2)^2-1]-8*9/2+1 =1260

籾朕斤貧炎短嗤住旗賠萱厘和中議殻會邪協議頁貫x醪志閏啜(-1)^(n-1) * x^(n-1) / (n-1)!匯慌n - 1遏 void main() { float s, t, x; int i, n; scanf("%f%d", &x, &n); t = x; for (i = 1; i < n; i ++) { s += t; t *= - x / (i + 1); }...

x1>=5 ,x4>=6,★ x1+ x4>=11 匆祥頁傍x2+x3

輝x1=2x2=0x3=-5x4=8扮 30-x1+x2+x3+x4=30-2+0+-5+8)=25 侭參犁詠攬25倖1蛍護撹4何蛍耽何蛍崛富嗤0倖1。 飛4何蛍脅崛富嗤1夸葎C(223)=1540 飛3何蛍脅崛富嗤1複噫1何蛍葎0夸葎C(43)〜C(232)=1012 飛2何蛍...

遍枠御盆低x議n肝竹┝n肝圭辛參燕幣葎x^2。 潤惚(1x^n)/(1-x)=(x^n-1)/(x-1). 宸頁匯倖吉曳方双巷塀葎妻從a1挑an巷曳q Sa1(a1-an)/(1-q).

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