\(\frac{2}{3}\times\frac{4}{5}-\frac{1}{3}\times\frac{4}{5}\)
\(=\frac{8}{15}-\frac{4}{15}\)
\(=\frac{4}{15}\)
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hay tinh 1+2-3x4:5
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help
(1/1x2+1/2x3+1/3x4+........+1/8x9+1/9x10)x100-(5/2:x+(206/100:1/2)
( 1/1x2 + 1/2x3 + 1/3x4 + ... + 1/9/10 ) x 100 - ( 5/2 : ( x + 206/100 ) : 1/2 = 89
Tìm X:
(1/1x1+1/2x3+1/3x4+............+1/9x10)x100-[5/2:(X+206/100)]:1/2=89
1/1x2 +1/2x3+1/3x4+1/4 x 5......... 1/999x1000+1
tính nhanh : 1/3x4+1/4x6+3/6x9+4/9x13+5/13x18