tex] c - 1,5d) Упростите выражение Нужно оченнь сровноооооо !!!!...

August 2022 1 5 Report

1.
0,8*(x - 2)- 0,7 * (x-1) = 2,7
Решите уравнение
2. [tex] \frac{5}{7} [/tex] (2,8c - 4[tex] \frac{1}{5}[/tex]d ) - 2,4 *([tex] \frac{5}{6}[/tex] c - 1,5d)
Упростите выражение
Нужно оченнь сровноооооо !!!!

Answers & Comments

373050026 1.
0,8*(x - 2)- 0,7 * (x-1) = 2,7
0,8x - 1,6- 0,7x+0,7 = 2,7
0,1x - 0,9 = 2,7
0,1x = 2,7+0,9
0,1x=3,6
$x=\frac{3,6}{0,1}$
x=36
2.
$\frac{5}{7}(2,8c-4\frac{1}{5}d)-2,4*(\frac{5}{6}c-1,5d)=\$

$=\frac{5}{7}(\frac{14}{5}c-\frac{21}{5}d)-\frac{12}{5}*(\frac{5}{6}c-\frac{3}{2}d)=\\\\
=(\frac{14*5}{5(7}c-\frac{21*5}{5*7}d)-(\frac{5*12}{6*5}c-\frac{3*12}{2*5}d)=(2c-3d)-(2c-\frac{18}{5}d)=\\\\=(2c-3d)-(2c-3,6d)=2c-3d-2c+3,6d=0,6d$

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