Question

Выполните умножения в дробях;

а) 14,25 * 6,4=

б) 15,04 * 0,125=

в) 0,816 * 0,035=

г) 22,5  * 4,006=

д) 0,81 * 1,033=

е) 4,25 * 0,00444=

ж) 3600 * 2,005=

з)0,705 * 64,46=

и)0,0155 * 1200

Answer 1

а) $14,25cdot6,4=14frac{25}{100}cdot6frac{4}{10}=14frac{5}{20}cdot6frac{2}{5}=frac{285}{20}cdotfrac{32}{5}=frac{456}{5}=91frac{1}{5}=91,2$

б) $15,04cdot0,125=15frac{4}{100}cdotfrac{125}{1000}=15frac{1}{25}cdotfrac{5}{40}= frac{376}{25}cdotfrac{5}{40}=frac{94}{50}=1frac{44}{50}=1,88$

в) $0,816cdot0,035=frac{816}{1000}cdotfrac{35}{1000}=frac{204}{250}cdotfrac{7}{200}= frac{357}{12500}=0,02856$

г) $22,5cdot4,006=22frac{5}{10}cdot4frac{6}{1000}=22frac{1}{2}cdot4frac{3}{500}=frac{45}{2}cdotfrac{2003}{500}=frac{18027}{200}=90,135$

д) $0,81cdot1,033=frac{81}{100}cdot1frac{33}{1000}=frac{81}{100}cdotfrac{1033}{1000}= frac{83673}{100000}=0,83673$

е) $4,25cdot0,00444=4frac{25}{100}cdotfrac{444}{100000}=4frac{5}{20}cdotfrac{111}{25000}=frac{85}{20}cdotfrac{111}{25000}=frac{1887}{100000}=0,01887$

ж) $3600cdot2,005=3600cdot2frac{5}{1000}=3600cdot2frac{1}{200}=3600cdotfrac{401}{200}=7218$

з) $0,705cdot64,46=frac{705}{1000}cdot64frac{46}{100}=frac{705}{1000}cdot64frac{23}{50}=frac{705}{1000}cdotfrac{3223}{50}=frac{454443}{10000}=45,4443$

и) $0,0155cdot1200=frac{155}{10000}cdot1200=frac{31}{2000}cdot1200=frac{93}{5}=18frac{3}{5}=18,6$