= ( 1 + 9 ) + ( 2 + 8 ) + ( 3 + 7 ) + ( 4 + 6 ) + 5 +10
= 10 + 10 + 10 + 10 + 5 +10
= 55
= ( 1 + 9 ) + ( 2 + 8 ) + ( 3 + 7 ) + ( 4 + 6 ) + 5 +10
= 10 + 10 + 10 + 10 + 5 +10
= 55
8/9÷3/7=
8/9+2/5=
7/8-1/3=
3/10×1/6=
b.hỗn số
1 2/7+6 5/6=
5 3/4-1/5 =
6 2/9÷4 7/10=
5/3+3/2-7/6=
1+1+1+1+2+2+2+3+3+3+3+4+4+4+4+5+5+5+5+6+6+6+6+7+7+7+7+8+8+8+8+9+9+9+9+10=
9-8-7-6-5-4-3-2-1-10+1+2+3+4+5+6+7+8+9+10=......X10000000000000000000000000=
Sap xep cac phan so sau theo thu tu tu lon den be
8/9; 4/5; 9/8; 3/4; 10/9; 12/12; 7/8; 1/6; 1/4; 3/2; 1/5; 8/7; 6/5; 5/6; 4/3; 6/7; 2/3; 2/15; 1/2;5/4
1/1+2/3+3/4+4/5+5/6+6/7+7/8+8/9+9/10=bao nhiêu
1*2*3*4*5*6*7*8*9
10*2*3*4*5*6*7*8*9
1*2*3*4*5*6*7*8*9
10*2*3*4*5*6*7*8*9
Tính nhanh:
1+3+5+7+9+2+4+6+8+10+1+3+5+7+9+...+99+2+4+6+8+...+100+1+3+5+7+9+...+999+2+4+6+8+...+1000
(Ai trả lời đầy đủ, đúng và sớm nhất sẽ được like)
1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10
2 + 4 + 6 + 8 + 10 + 12 + 14 + 16 + 18 + 20
1 + 3 + 5 + 7 + 9 + 11 + 13 + 15 + 17 + 19
ai giúp em câu này đi
a,6/1*3*7+6/3*7*9+6/7*9*13+6/9*13*15+6/13*15*19
b,1/1*3*7+1/3*7*9+1/7*9*13+1/9*13*15+1/13*15*19
c,1/2*4*6+1/4*6*8+1/6*8*10+1/8*10*12*14+...+1/96*98*100
d,5/1*5*8+5/5*8*12+5/8*12*15+...+5/33*36*40
* là dấu nhân / là phần nha