八年级上数学一次函数与三角形全等专练及答案(2套)（The mathematical function of the eighth grade and the whole class of the triangle (2 sets)）.doc

八年级上数学一次函数与三角形全等专练及答案(2套)（The mathematical function of the eighth grade and the whole class of the triangle (2 sets)） 2 + 0.1 x B. Y = 0.1 x c. y = -0.1 + 0.1 x d. y = 0.5 + 0.1 x 7. As shown in the figure, in the middle, we know that the bisector of Angle B and Angle C intersect at the point F, and the point F is DF / / BC, and the line AB is at point D, AC at point E, and if BD + CE = 9, the length of the line segment DE is (). A.6 b.7 c.8 d.9 8. As shown in the figure, there is a right Angle triangular piece of paper, which folds the AC edge along the line AD, so that it falls on the hypotenuse AB, which is known as BC = 6cm, and CD: DB = 1:2, and the distance from D to AB is (). A: A. 1cm b. 2cm c. 3cm d. no In the following figures, not the axisymmetric graph is () A. blunt b. positive polygon c. parallelogram d. isosceles trapezoid 3. Solution 1. A spring is 13 centimeters long, and the weight of a mass that can hang is 16 kilograms, and the weight of each weight is 1 kilogram, which is 0.5 centimeters long. O: (1) the relationship between the length of the spring and the length of the spring (cm) and the weight x (kg); (2) the range of values of the independent variable; 2. The image of A known function passes through A (1, 2), B (-1, 1). (1) solve the function and draw the image. (2) why is x value, y 0, y = 0, y 0? (3) when negative 3 x 1, evaluate the range of y. (4) when negative 3 is less than or equal to 1, evaluate the range of x. 3. As shown in figure AB = DE, AC = DF, BF = EC, verify: AC / / DF, AB / / ED. (1) draw an acute Angle, extend AB to E, and extend AC to D. Draw the bisector of Angle CBE and Angle BCD and give it to point F. (2) ask the measurement points F to the distance between the two sides of Angle A, are they equal? (3) according to the result of drawing process and measurement, the graph is given known and proof and proved. 5. It is known, as shown in figure AB = AC, DE / / BC, to verify: BD = CE. 6. It is known that figure AD is