Question

2) Calculati: a) 1/2+2/3+3/4 b) 1/3+2/5+5/6 c) 3/4+5/6+7/12


va rog ajutor

/(supra)​

Answer 1

Răspuns:

$a) \frac{1}{2} +\frac{2}{3} +\frac{3}{4}= \frac{6+8+9}{12} =\frac{23}{12}$

$b) \frac{1}{3} +\frac{2}{5}+\frac{5}{6} =\frac{10+12+25}{30} =\frac{47}{30}$

$c) \frac{3}{4} +\frac{5}{6} +\frac{7}{12}=\frac{9+10+7}{12} =\frac{26}{12} =\frac{13}{6}$

Answer 2

Explicație pas cu pas:

$a) ^{6)} \frac{1}{2} + ^{4)} \frac{2}{3} + ^{3)}\frac{3}{4} = \frac{6}{12} + \frac{8}{12} + \frac{9}{12} = \frac{6 + 8 + 9}{12} = \frac{23}{12}$

$b) ^{10)} \frac{1}{3} +^{6)} \frac{2}{5} + ^{5)}\frac{5}{6} = \frac{10}{30} + \frac{12}{30} + \frac{25}{30} = \frac{47}{30}$

$c) ^{3)}\frac{3}{4} + ^{2)}\frac{5}{6} +\frac{7}{12} = \frac{9 + 10 + 7}{12} = \frac{26}{12} ^{(2} = \frac{13}{6}$

formula pentru amplificare:

$^{c)} \frac{a}{b} = \frac{a \times c}{b \times c}$

formula pentru simplificare:

$\frac{a}{b}^{(c} = \frac{a \div c}{b \div c}$