999999 x 9999999
9+99+999+9999+99999+999999+9999999+99999999=?
9+99+999+9999+99999+999999+9999999+99999999+999999999+9999999999 = ?
9 . 1 + 9. 11 + 9.111 + 9.1111 + 9.11111 + 9.111111 + 9.1111111 + 9.11111111 + 9.111111111 + 9.1111111111
9+99+999+9999+99999+999999+9999999+99999999+999999999+9999999999
tính nhanh
= (10-1) + (100 -1) + (1000-1) + (10000-1) + ............+ (10000000000-1)
= ( 10+100+1000+10000+..........+10000000000) - (1+1+1+1+..........+1+1)
=11111111110 - 1.10
=1111111100
= (10-1) + (100 -1) + (1000-1) + (10000-1) + ............+ (10000000000-1)
= ( 10+100+1000+10000+..........+10000000000) - (1+1+1+1+..........+1+1)
=11111111110 - 1.10
=1111111100
x*9999999/33645=
9999999 - 9999999 =
9999999 - 9999999 =0
nha bn k mk nha bn
thanks nhju
tính nhanh ( nếu có thể ) :
H=9999999/2-9999999/3-9999999/6
( ghi cả cách làm )
quy dồng mẫu lên 6 rồi bấm máy mà trừ
\(H=\frac{9999999}{2}-\frac{9999999}{3}-\frac{9999999}{6}\)
\(\Rightarrow H=9999999.\left(\frac{1}{2}-\frac{1}{3}-\frac{1}{6}\right)\)
\(\Rightarrow H=9999999.0\)
\(\Rightarrow H=0\)
tính nhanh ( nếu có thể )
H=9999999/2-9999999/3-9999999/6
( ghi cách làm )
dài thế làm sao ma cộng được
không biết
cái ông bảo cộng dể thì cộng ik xem lào
x = 9+99+999+...+999999......9{số 999999......9 có 100 chữ số 9}. tìm x
5555555-9999999