Current location - Training Enrollment Network - Mathematics courses - What unit is the combination of numbers and shapes in junior high school in Zhejiang Education Edition?
What unit is the combination of numbers and shapes in junior high school in Zhejiang Education Edition?
The combination of numbers and shapes in junior middle schools in Zhejiang Education Press is in unit 16, and the special training of the combination of numbers and shapes in the seventh grade mathematics volume 16 of Zhejiang Education Press is 1. As shown in the figure, the corresponding points of rational numbers A, B, C and D on the number axis are A, B, C and D respectively. If a+c=0, then b+d ()?