\(\frac{8x75x3+6x25x4-240}{15x2x6+18x16x5}\)

=\(\frac{2x4x5x5x3x3+2x3x5x5x4-3x2x4x2x5}{3x5x2x2x3+3x2x3x2x2x4x5}\)

=\(\frac{2x3x4x5x\left(5x3+5-2\right)}{3x2x3x5x2x\left(1+2x4\right)}\)

=\(\frac{2x18}{3x9}\)

=\(\frac{4}{3}\)

x là nhân hả cậu

\(a.\frac{6}{240}=\frac{1}{40};\frac{12}{240}=\frac{1}{20};\frac{15}{240}=\frac{1}{16};\frac{60}{240}=\frac{1}{4}\)

\(b.\frac{6}{336}=\frac{1}{56};\frac{8}{336}=\frac{1}{42};\frac{52}{336}=\frac{13}{84};\frac{56}{336}=\frac{1}{6}\)

a) 6/240=1/40 ; 12/240=1/20 ; 15/240=1/16 ; 60/240=1/4

b) 6/336=1/56 ; 8/336=1/42 ; 52/336=13/84 ; 56/336=1/6

a) \(\frac{1}{40}\);\(\frac{1}{20}\);\(\frac{1}{16}\);\(\frac{1}{4}\)

b) \(\frac{1}{56}\);\(\frac{1}{42}\);\(\frac{13}{84}\);\(\frac{1}{6}\)

mk nhanh nhất

P=1/1990 có phải không

tớ nhầm 1991x1993-1 mới đúng

a) 36.(250+87)+64.(240+97)

=  36.( 240+10+87) + 64.(240+97)

=  (240+97) . (36+64)

=     337.100

=        33700

b) 42.63+47.156-47.114

= 42.63 + 47.(156-114)

= 42.63 + 47.42

= 42.(63+47)

= 42.100

= 4200

k nha!

A=1/3+1/9+1/27+....+1/72171

3A=1/3x3+1/9x3+1/27x3+....+1/72171x3

3A=1+1/3+1/9+1/27+....+1/24057

3A-A=(1+1/3+1/9+1/27+...+1/24057)-(1/3+1/9+1/27+...+1/72171)

3A-A=1+1/3+1/9+1/27+...+72171-1/3-1/9-1/27-....-1/72171

=1-1/72171

2A=72170/72171

A=72170/72171:2

A=36085/72171

Đổi 1km = 1000m

Tổng số phần = nhau là :

2+3 =5 (phần)

Đoạn thẳng MB dài là :

1000 :\(\frac{5}{3}\)= 600 (m)

Đáp số : Inbox 600 m