# Solving systems by substitution

In algebra, one of the most important concepts is Solving systems by substitution. We will give you answers to homework.

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We will also give you a few tips on how to choose the right app for Solving systems by substitution. The area of the rectangular area formed by the Yellow L-shape and the green L-shape that originally changed is equal again. The two (triangles) that were originally thought to be chord concave and chord convex are congruent in area. Because there are no more tools that can be measured in detail, we take an approximate value: 5 for green shares and 8 for red shares. To calculate the area change due to the position change of the blue and red triangles in the (large triangle).

How to calculate the sum of squares on the left or right side of the equation? They are the sum of the squares of the consecutive natural numbers after the first several items are incompletely removed. The sum of the squares of the previous several items is subtracted from the sum of the squares of the n items, and the rest is the sum of the squares of the required consecutive natural numbers Since their left and right sides are equal, they can be calculated with several squares on the right side, and they don't need a calculator or a draft paper at all. It's OK to write steps while doing mental calculations. Of course, this is a case where the number of calculation items is relatively small.

The fourth is the solution of mathematical problems, which requires students to understand some calculation application software. The fifth is to test the model. Whether the established mathematical model is effective or not, the inspection link is very important. For example, in high school mathematics, the sum of the general terms of the number series is a relatively difficult problem, and the solving skills are varied. The number series is often regarded as the final item in college entrance examination mathematics.

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