Toán Lớp 7: $\frac{3^69. 10^70}{6^71. 5^69}$
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Toán Lớp 7: $\frac{3^69. 10^70}{6^71. 5^69}$
Comments ( 2 )
(3^69. 10^70)/(6^71. 5^69)
= (3^69. (2.5)^70)/((2.3)^71. 5^69)
= (3^69. 2^70. 5^70)/(2^71. 3^71. 5^69)
= (3^69. 2^70. 5^70)/(3^71. 2^71. 5^69)
= (1. 1. 5)/(3^2. 2.1)
= 5/(9.2)
= 5/18
(3^{69}.10^{70})/(6^{71} .5^{69})
=(3^{69} . (2.5)^{70} )/((2.3)^{71} . 5^{69})
=(3^{69} . 2^{70} . 5^{70})/(2^{71}.3^{71}.5^{69})
=(3^{69}.2^{70}.5^{69}.5)/(2^{70}.2.3^{69} .3².5^{69})
=5/(2.3²) ( giản ước 3^{69}.2^{70}.5^{69} )
=5/(2.9)=5/18