Question

125. 1) 4/а = 16/20; 2) с/8 = 25/40;
3) 40 : 0,2 = z : 3; 4) 49/32 = 12/d .​

Answer 1

Пошаговое объяснение:

$1) \: \: \frac{4}{a} = \frac{16}{20} \\ a \times 16 = 4 \times 20 \\ 16a = 80 \\ a = \frac{80}{16} \\ a = 5$

$2) \: \: \frac{c}{8} = \frac{25}{40} \\ c \times 40 = 8 \times 25 \\ 40c = 200 \\ c = \frac{200}{40} \\ c = 5$

$3) \: \: 40 \div 0.2 = z \div 3 \\ 40 \times 3 = 0.2 \times z \\ 120 = 0.2z \\ 0.2z = 120 \\ z = \frac{120}{0.2} \\ z = 600$

$4) \: \: \frac{49}{32} = \frac{12}{d} \\ 49 \times d = 32 \times 12 \\ 49d = 384 \\ d = \frac{384}{49} \\ d = 7 \frac{41}{49}$