六年级数学应用题大全下（The sixth grade mathematics should be under the whole）.docVIP

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六年级数学应用题大全下（The sixth grade mathematics should be under the whole）.doc

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六年级数学应用题大全下（The sixth grade mathematics should be under the whole）

六年级数学应用题大全下（The sixth grade mathematics should be under the whole） Ratio and proportion The significance and nature of 1 (1) significance The ratio of two to two Numbers. : is the ratio number, read ratio. The number in front of the ratio, which is referred to as the preceding paragraph, is called the back of the ratio. The ratio of the preceding paragraph divided by the quotient of the following item is called the ratio. Compared with the division, the preceding paragraph is equal to the number of divisor, and the latter is equal to the divisor, and the ratio is equal to quotient. The ratio is usually expressed as a fraction, or as a decimal, sometimes as an integer. The posterior term of the ratio cannot be zero. According to the relationship between the score and the division, the preceding paragraph is the equivalent of the numerator, the latter is the denominator, and the ratio is equivalent to the score value. (2) properties of ratio The ratio of the preceding and the following items is multiplied by or divided by the same number (except for 0), the ratio is constant, which is called the basic property of the ratio. (3) the ratio and the simplification ratio The ratio is calculated by dividing the preceding item by the preceding item, and the result is a number that can be an integer or a decimal or a fraction. The basic property of the ratio can be compared to the simplest integer ratio. The result must be the simplest ratio, that is, the front and the back are the number of each other. (4) scale Distance: actual distance = scale Ask for a scale; We know the distance from the graph and the actual distance from the scale; We know the actual distance and the distance from the scale. Line scale: a line segment is attached to the graph to indicate the actual distance corresponding to the ground. (5) distribute according to proportion In agricultural production and daily life, it is often necessary to assign a quantity to a certain ratio. This method of distributi