七年级上册数学复习资料（Review the data of seven grade math）.docVIP

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七年级上册数学复习资料（Review the data of seven grade math）.doc

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七年级上册数学复习资料（Review the data of seven grade math） Book One The first chapter is rational number 1.1 positive and negative numbers The number of the previous 0 than previously learned plus minus - the number is negative. The number 0 before is called a positive number. Number 0 is neither positive nor negative, and 0 is the boundary between positive and negative numbers. In the same question, the quantity expressed in positive and negative numbers has the opposite meaning 1.2 rational number 1.2.1 rational number Positive integers, 0 and negative integers are called integers. Positive and negative fractions are called integers. Integers and fractions are called rational numbers. 1.2.2 axis The provisions of the origin, is straight direction, unit length is called axis. The axis of the role: all rational numbers can be used to express the points on the axis. Note: the origin, the axis of the positive direction, the unit length of three elements are indispensable. The same axis cannot change per unit length. In general, is a positive number, then the axis said a point at the origin of the right, and the distance from the origin is a per unit length; alpha indicates the number of points in the origin of the left, and the distance from the origin is a unit of length a. 1.2.3 opposite number Only two numbers with different symbols are called opposite numbers. Said the two opposite number origin symmetric axis. Add the - number at the front of any number, and the new number means the inverse of the original number. 1.2.4 absolute value In general, the axis represents the number of a points and the distance from the origin is called the absolute value of A. The absolute value of a positive number is itself; the absolute value of a negative is the opposite of it; the absolute value of 0 is 0. Said the rational number in the axis, they order from left to right, is the order from small to large, that is less than the number to the left of the right number. Comparison of the siz