Question

Обчислите: 6,25*3,4= 0,0017*7,8= 32,291*100= 24,1: 1000= 48,24: 12= 7: 28= 7,31: 3,4= 18: 0,45=

Answer 1

$6,25*3,4= \frac{625}{100} * \frac{34}{10} = \frac{21250}{1000} =\frac{2125}{100} =21,25$

$0,0017*7,8= \frac{17}{10000} * \frac{78}{10} = \frac{1326}{100000}=0,01326$

$32,291*100= \frac{32291}{1000} *100=\frac{32291}{10} *1=3229,1$

$24,1:1000= \frac{241}{10} :1000=\frac{241}{10} * \frac{1}{1000} = \frac{241}{10000} =0,0241$

$48,24:12= \frac{4824}{100} :12=\frac{4824}{100}* \frac{1}{12} =\frac{402}{100}* 1 =4,02$

$7:28=7* \frac{1}{28} =1* \frac{1}{4} = \frac{1}{4} =0,25$

$7,31:3,4= \frac{731}{100} : \frac{34}{10} =\frac{731}{100} * \frac{10}{34} =\frac{43}{100} * \frac{10}{2}=\frac{43}{100} *5= \frac{215}{100} =2,15$

$18:0,45=18: \frac{45}{100} =18* \frac{100}{45} =18* \frac{20}{9} =2*20 =40$

Answer 2

$1)6.25*3.4=21.25\\2)0.0017*7.8=0.01326 \\ 3)32.291*100=3229.1 \\ 4)24.1/1000=0.0241 \\ 5)48.24/12=4.02\\6)7/28=0.25\\7)7.31/3.4=2.15 \\ 8) 18/0.45=40$