Question

ПОМОГИТЕ даю 30 баллов!!!!

Answer 1

1416.

(13,4 - у) * 4,3 - 20,05 = 78,05 + 6,7у,
57,62 - 4,3у - 20,05 = 78,05 + 6,7у,
11у = -40,48,
у = -3,68,

(16,2 - х) * 3,2 - 50,08 = -8,12 - 5,1х,
51,84 - 3,2х - 50,08 = -8,12 - 5,1х,
1,9х = -9,88,
х = -5,2,



816.

70 кг карт.  ----  14 кг крахм.,  ?%,

(14 : 70) * 100% = 1/5 * 100% = 20%,


819.

222 1/25 : (131 - 128 2/5) + 46 1/2 : 3/10 = 238 2/5,

1) 131 - 128 2/5 = 130 5/5 - 128 2/5 = 2 3/5,
2) 222 1/25 : 2 3/5 = 5551/25 : 13/5 = 5551/25 * 5/13 = 427/5 = 85 2/5,
3) 46 1/2 : 3/10 = 93/2 * 10/3 = 5 * 31 = 155,
4) 85 2/5 + 155 = 240 2/5

Answer 2

a)
(13,4-y)*4,3-20,05=78,05+6,7y
57,62-4,3y-20,05=78,05+6,7y
37,57-4,3y=78,05+6,7y
-4,3y-6,7y=78,05-37,57
-11y=40,48
y=-3,68

б)
(16,2-x)*3,2-50,08=-8,12-5,1x
51,84-3,2x-50,08=-8,12-5,1x
1,76-3,2x=-812-1,76
1,9x=-9,88
x=-5,2

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70 кг карт
14 кг крахм
крахм ?%

(14:70)*100%=1/5*100%=20%

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$222 \frac{1}{25} \div (131 128 \times \frac{2}{5}) + \frac{93}{2} \times \frac{10}{3} = \frac{5551}{25} \div (131 - \frac{642}{5}) + \frac{93}{2} \times \frac{10}{3} = \frac{5551}{25} \div \frac{13}{5} + 31 \times 5 = \frac{5551}{25} \times \frac{5}{13} + 155 = \frac{427}{5} + 155 = \frac{1202}{5}$