вычислите 2/105- 5/924=

<span>а)<em> 1/5 ц меньше 1/5 т</em></span>

<span>1/5ц=20кг, 1/5т=200кг</span>

<span><span>б) <em>1/5 ц равно 1/50 т</em></span></span>

<span><span>1/5ц=20кг, 1/50т=1000/50=20кг</span></span>

<span><span><span>в) <em>1/100 га больше 1/10 а</em></span></span></span>

<span><span><span>1/100га=10000м2/100=100м2</span></span></span>

<span><span><span>1/10а=100м2/10=10м2</span></span></span>

<span><span><span><span>г) <em>1/10 л больше 20 см3</em></span></span></span></span>

<span><span><span><span>1/10л=100см3</span></span></span></span>

<span><span><span><span><span>д) <em>1/4 кг равно 250 г</em></span></span></span></span></span>

<span><span><span><span><span>1/4кг=1000/4=250г.</span></span></span></span></span>

345 = 3 * 5 * 23 * 1

390 = 2 * 3 * 5 * 13 * 1

НОД (345 и 390) = 3 * 5 * 1 = 15