Các câu hỏi tương tự
1/10+2/20+3/30+4/40+5/50+6/60+7/70+8/80+9/90 = ?
Tinh nhanh
1*2*3+2*3*4+3*4*5+...+29*30*31
1.tính bằng cách thuận tiện nhất.
a)1/10+2/20+3/30+4/40+5/50+6/60+7/70+8/80+9/90
=
=
1/10+2/20+3/30+4/40+5/50+6/60+7/70+8/80+9/90
hãy kb với mình nhé
tính bằng cách thuận tiện nhất:
1/10+2/20+3/30+4/40+5/50+6/60+7/70+8/80+9/90
Tính nhanh:
a,1/4+2/5+6/8+9/15+8/1
b,1/2+2/4+3/6+4/8+5/10+6/12+7/14+8/16+9/18+10/20
c,1/10+4/20+9/30+16/40+25/50+36/60+49/70+64/80+81/90
Tính nhanh:
a,1/4+2/5+6/8+9/15+8/1
b,1/2+2/4+3/6+4/8+5/10+6/12+7/14+8/16+9/18+10/20
c,1/10+4/20+9/30+16/40+25/50+36/60+49/70+64/80+81/90
tính bằng cách thuận tiện nhất:
1/10 + 2/20 + 3/30 + 4/40 + 5/50 + 6/60 + 7/70 + 8/80 + 9/90
=......................................................................................
=......................................................................................
(31 6/13 + 5 9/31) - 30 6/13=?