Question

B) 23/4 + 34/5 =
D) 31/2 - 21/3 =
F) 6/8 X 2/4 =
28 57:23=

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Answer 1

Respuesta:

B)   $\frac{23 }{4} + \frac {34 }{5} = \frac {23 \cdot 5 }{4 \cdot 5} + \frac {34 \cdot 4 }{5 \cdot 4} = \frac {115 }{20} + \frac {136 }{20} = \frac {115 + 136 }{20} = \frac { 251 }{20}$

D)   $\frac{31 }{2} - \frac { 21 }{3} = \frac{31 }{2} - 7 = \frac{31} {2} - \frac{ 7\cdot2 }{2} = \frac {31 }{2} - \frac {14 }{2} = \frac{ 31 - 14 }{2} = \frac {17 }{2}$

F)   $\frac{6 }{8} \cdot \frac{ 2 }{4} = \frac { 3\cdot2 }{4\cdot2} \cdot\frac {1\cdot2 }{2\cdot2} = \frac{3 }{4} \cdot \frac{ 1 }{2} = \frac{ 3\cdot1 }{4\cdot2} = \frac{3 }{8}$