Question

Помогите пожалуйста решить!!!!​

Answer 1

#1

1)

$5 \times \frac{1}{5} \times \frac{5}{13} \div 1 \times \frac{1}{2} = \frac{26 \times 5}{5 \times 13} \div 1 \times \frac{1}{2} = 2 \times \frac{2}{3} = \frac{4}{3} = 1.(3)$

2)

$(2 \times \frac{1}{10} \div 2 - 1.8) \div 0.4 = \frac{21}{10 \times 2} - 1.8 \div 0.4 = (1.05 - 1.8) \div 0.4 = - 0.75 \div 0.4 = 1.875$

#2

5(х-7)=3(х-4)-27

5х-35=3х-12-27

5х-35-3х+12+27=0

2х+4=0

2х= -4

х= -2

#3

$\frac{b {}^{3} \times b {}^{5} \times b {}^{2} }{(b {}^{3}) {}^{2} } = \frac{b {}^{3} \times b {}^{5} \times b {}^{2} }{b {}^{5} } = b {}^{3} \times b {}^{2} = b {}^{5} = 2 {}^{5} = 32$

#4

Мастер = 3х

Ученик = х

Всего = 312

3х+х=312

4х=312

х=78 - ученик

3×78=234 - мастер

#5

Т.к. МNP - р/б, то MN=NP=17

Значит Р=NK+KP(=1/2MP)+PN=8+15+17=40(см)