Variables and Algebraic Expressions: Decimal numbers

Question 1

$7.3\cdot4a+2.3+8a=\text{?}$

Question 2

$3.4-3.4a+2.6b-7.5a=\text{?}$

Question 3

$39.3:4a+5a+8.2+13z=\text{?}$

Question 4

^{$5.6x+7.9y+53xy+12.1x=\text{?}$}

Question 5

^{$7.8+3.5a-80b-7.8b+3.9a=\text{?}$}

Examples with solutions for Variables and Algebraic Expressions: Decimal numbers

$7.3\cdot4a+2.3+8a=\text{?}$

It is important to remember that when we have numbers and variables, it is impossible to add or subtract them from each other.

We group the elements:

$7.3×4a + 2.3 + 8a =$

$29.2a + 2.3 + 8a =$

$37.2a + 2.3$

And in this exercise, this is the solution!

You can continue looking for the value of a.

But in this case, there is no need.

$37.2a+2.3$

$3.4-3.4a+2.6b-7.5a=\text{?}$

^{$3.4-10.9a+2.6b$}

$39.3:4a+5a+8.2+13z=\text{?}$

_{^{$13z+8.2+\frac{9.825}{a}+5a$}}

^{$5.6x+7.9y+53xy+12.1x=\text{?}$}

_{^{$17.7x+53xy+7.9y$}}

^{$7.8+3.5a-80b-7.8b+3.9a=\text{?}$}

^{$7.8+7.4a-87.8b$}