Plane graphics are divided into (angles) (polygons) (circles), and polygons include (triangles) (rectangles) (trapezoid) (squares).

The simplification of fractions is based on (the basic properties of fractions).

The basic properties of a fraction (the numerator and denominator of a fraction are multiplied or divided by the same number at the same time (except 0), and the size of the fraction remains unchanged)

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