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2 4 3 9 5 20 7

全部答案如下: 1喜上眉梢 2妖魔鬼怪 3余音绕梁 4盲人摸象 5鸡飞蛋打 6心照不宣 7人走茶凉 8刀光剑影 9七嘴八舌 10悲欢离合 11雷声震耳 12舍己救人 13眉目传情 14猪朋狗友 15一阵见血 16愁眉苦脸 17指腹为婚 18一拍即合 19花好月圆 20骑虎难下

先通分 1/3+3/4+2/5+5/7+7/8+9/20+10/21+11/24+12/35 =(1/3+5/7+10/21)+(3/4+7/8+9/20+11/24)+(2/5+12/35) =(7/21+15/21+10/21)+(90/120+105/120+54/120+55/120)+(14/35+12/35) =32/21+304/120+26/35 =134400/88200+223440/88200+65520/88200 =4...

3/4+2/5+7/8+9/20+12/35+13/40 =3/4+7/8+2/5+12/35+9/20+13/40 =13/8十26/35+31/40 =13/8+31/40+26/35 =96/40十26/35 =12/5+26/35 =110/35 =22/7

采纳哦

#include #include int main() { int i; double s=0; for(i=1;i

3/2-5/6+7/12-9/20+11/30-……+99/2450 =(1+1/2)-(1/2+1/3)+(1/3+1/4)-(1/4+1/5)+(1/5+1/6)-......+(1/49+1/50) =1+1/2-1/2-1/3+1/3+1/4-1/4-1/5+1/5+1/6-......+1/49+1/50 =1+1/50 =51/50

原式=3/2-(1/2+1/3)+(1/3+1/4)-(1/4+1/5)+(1/5+1/6)-(1/6+1/7)+(1/7+1/8) =3/2-1/2-1/3+1/3+1/4-1/4-1/5+1/5+1/6-1/6-1/7+1/7+1/8 =3/2-1/2+1/8 =1+1/8 =9/8

20+1=21 19+2=21 …… 以此类推,一共是11组,21X11=231

#include int main() {int i,j; printf("* "); for(i=1;i

1 : 1 + 2 + 3 + 45 + 6 - 7 * 8 = 1 2 : 1 + 2 + 3 + 45 - 6 * 7 - 8 = 1 3 : 1 + 2 + 3 - 4 - 56 / 7 / 8 = 1 4 : 1 + 2 + 3 * 4 - 5 + 6 - 7 - 8 = 1 5 : 1 + 2 + 3 * 4 * 5 - 6 - 7 * 8 = 1 6 : 1 + 2 + 3 / 4 * 5...

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