Question

1)2,9(х-3,4)=14,5 2)0,87:0,29+0,36:12+8,4:0,12+0,081:0,9=?

Answer 1

1)2,9(х-3,4)=14,5
   х-3,4=14,5:2,9
   х-3,4=5
   х=5+3,4
   х=8,4
   Проверка
   2,9(8,4-3,4)=14,5
2)1)0,87:0,29=3
    2)0,36:12=0,03
    3)8,4:0,12=70
    4)0,081:0,9=0,09
    5)3+0,03=3,03
    6)3,03=70=73,03
    7)73,03+0,09=73,12

Answer 2

Let's solve each of the given equations:

1. $2.9(x - 3.4) = 14.5$

Distribute the 2.9 on the left side:

$2.9x - 2.9 \times 3.4 = 14.5$

$2.9x - 9.86 = 14.5$

Now, isolate $x$ by adding 9.86 to both sides:

$2.9x = 14.5 + 9.86$

$2.9x = 24.36$

Divide by 2.9 to solve for $x$:

$x = \frac{24.36}{2.9}$

$x \approx 8.4$

So, $x \approx 8.4$.

2. $0.87 ÷ 0.29 + 0.36 ÷ 12 + 8.4 ÷ 0.12 + 0.081 ÷ 0.9$

Perform the divisions:

$\frac{0.87}{0.29} + \frac{0.36}{12} + \frac{8.4}{0.12} + \frac{0.081}{0.9}$

$3 + 0.03 + 70 + 0.09$

Add these values:

$3 + 0.03 + 70 + 0.09 = 73.12$

So, the solution to the second equation is $73.12$.