40,67x4+40,67x5+40,67

= 40,67x(4+5+1)

= 40,67x 10

= 406,7

Các câu sau làm tương tự

 nhaXuân Sáng_Clever_2005

40,67 x 4 + 40,67 x 5 + 40,67
= 40,67 x 4 + 40,67 x 5 + 40,67 x 1
= 40,67 x ( 4 + 5 + 1 )
= 40,67 x 10
= 406,7

99 x 7 + 99 x 2 + 99
= 99 x 7 + 99 x 2 + 99 x 1
= 99 x ( 7 + 2 + 1 )
= 99 x 10
= 990

67 x 13 + 67 x 7 + 67
= 67 x 13 + 67 x 7 + 67 x 1
= 67 x ( 13 + 7 + 1 )
= 67 x 21
= 1407
Ai tích mình, mình tích lại! Hứa luôn!

=5phần9

x : (112 - 99 ) = 17 nhan 5

x : 13 = 85 

x = 85 x 13 

x = 1105

x : (112 - 99) = 17 x 5

x : 13 = 85

x = 85 x 13

x = 1105

goodluck

A=1/3*5 + 1/5*7 + ....+ 1/99*101

A=1/2(2/3*5 + 2/5*7 + ...+ 2/99*101)

A=1/2[(1/3-1/5)+(1/5-1/7)+...+(1/99-1/101)]

A=1/2(1/3-1/101)

A=1/2 * 98/303

A=49/303

\(A=\frac{1}{5}+\frac{1}{35}+\frac{1}{63}+\frac{1}{99}+...+\frac{1}{9999}\)

\(=\frac{1}{3X5}+\frac{1}{5X7}+\frac{1}{7X9}+\frac{1}{9X11}+...+\frac{1}{99X101}\)

\(2A=\frac{2}{3X5}+\frac{2}{5X7}+\frac{2}{7X9}+\frac{2}{9X11}+...+\frac{2}{99X101}\)

\(=\frac{5-3}{3X5}+\frac{7-5}{7X9}+\frac{9-7}{9X7}+\frac{11-9}{9X11}+...+\frac{101-99}{101}\)

\(=\frac{1}{3}-\frac{1}{5}+\frac{1}{5}-\frac{1}{7}+\frac{1}{7}-\frac{1}{9}+\frac{1}{9}-\frac{1}{11}+...+\frac{1}{99}-\frac{1}{101}\)

\(=\frac{1}{3}-\frac{1}{101}=\frac{98}{303}\)

Từ đó ta suy ra:\(A=\frac{98}{303}:2=\frac{49}{303}\)

2A=2/3.5+2/5.7+2/7.9+...+2/99.101=>2A=1/3-1/5+1/5-1/7+...+1/99-1/100=>2A=1/3-1/100=>2A=97/300=>A=97/600

\(\frac{49}{303}\)

tinh nhanh a= 1/15 + 1/35 + 1/65 + 1/99 ... + 1/9999

99+99+99=99x3=297 nhé bạn

99 x ( 23 + 57 + 20 ) + ( 1 + 2 + 3 +...+ 100 ) = ( 100 - 1 ) +1 = 100

= 99 x 100 + [(100 + 1 ) x 100 : 2 ] 

= 9900 + 5050

= 14950

=  99 X ( 23 + 57 + 20 )  + {( 101 + 101 + ... + 101 ) CÓ 100 SỐ HẠNG }

= ( 99 X 100 ) + (101 X 100 : 2 )

 = 9900 + 5050 

= 14950

{(1+49)*5/20} + {(51+99)*5/20} = 50/4+150/4= 50