Question

1)(0,2x+0,4x)*3,5=6,3 2)6,25*8-3 2\3:5,5+2,4*4 7\12

Answer 1

Ответ:

(0,2х+0,4х)×3,5=6,3

0,8х=6,3:3,5

0,8х=1,8

х=1,8÷0,8

х=2,25

Answer 2

It seems like you've provided a set of mathematical expressions. Let's solve each expression step by step:

1. $(0,2x + 0,4x) \times 3,5 = 6,3$

   First, let's simplify the expression inside the parentheses: $0,2x + 0,4x = 0,6x$

   Now we have: $0,6x \times 3,5 = 2,1x$

   The equation becomes: $2,1x = 6,3$

   Finally, divide both sides by 2.1 to solve for $x$: $x = \frac{6,3}{2,1} = 3$

2. $6,25 \times 8 - \frac{3}{2} + \frac{2,4 \times 4}{7}$

   First, perform the multiplications and divisions: $50 - \frac{3}{2} + \frac{9.6}{7}$

   Convert $\frac{3}{2}$ to a decimal: $\frac{3}{2} = 1.5$

   Now calculate the remaining division and subtraction: $50 - 1.5 + 1.3714 \approx 49.8714$

So, the simplified value of the second expression is approximately $49.8714$.

Please note that I've used commas as decimal separators as you provided in your original expressions. However, in some regions, periods are used as decimal separators. If that's the case, the calculations would be slightly different.