Các câu hỏi tương tự
Tìm y: 1/30+(10/1×2+10/2×3+10/3×4+...+10/9×10)×y=3/1×2×3+3/2×3×4+3/3×4×5+...+3/8×9×10
1/2-1/3-2/3+1/4+2/4+3/4-1/5-2/5-3/5-4/5+...+1/10+2/10+3/10+...+9/10+10/10
tính tổng s=(1/2+1/3+1/4+...+1/10)+(2/3+2/4+...+2/10)+...+(8/9+8/10)+9/10
[9-(1/2+1/3+1/4+......+1/10)]:[1/2+2/3+3/4+.........+9/10].toán lớp 6
tính hợp lý :
a,6/5/12:2/3/4+11/1/4(1/3-1/4)
b,10/2/9+(2/2/5-7/2/9)
c,6/3/10-(3/4/7+2/3/10)
CHO A=17+1/2+2/3+4/5+5/6+4/7+3/8+2/9+1/10 và
B=1/2+1/3+1/4+1/5+1/6+1/7+1/8+1/9+1/10
Tính A= 1 - 1/2 +1/3 -1/4 +...+ 1/9 - 1/10
B= (1 + 1/2 + 1/3 +...+1/10) - 2(1/2 + 1/4 +...+ 1/10)
C= 1/6 + 1/7 + 1/8 + 1/9 + 1/10
Tính 1) 4/5 +13/18 2) 3/7 -11/8 3) -7/10 - -4/5 4) 3/20 -1/25 5) 2/3 - 5/6 6) 1/4 + -3/8 - 19/10 7) -9/10 - -7/18 8) 3/10 - 11/18 9) 3/5 -5/6 + -7/12 10) -4/9 - (-5 )/6 - 3/8
Tính :
C= 1/5+1/10+1/20+1/40+...+1/1280D= 2/1*3+2/3*5+2/5*10+2/7*9+2/9*11+2/11*18+2/13*15E= 4/3*7+4/7*11+4/11*15+4/15*19+4/19*23+4/23*27G= 1/2+1/6+1/12+1/20+1/30+1/42+...+1/110H= 3/1*2+3/2*3+3/3*4+3/4*5+...+3/9*10Giúp mk nha *.*