Answers to supplementary exercises in mathematics in the first semester of junior high school - Training Enrollment Network

Answers to supplementary exercises in mathematics in the first semester of junior high school

P79

(x-50)； (x+70)； 3; 5; Speed of journey from Wangjiazhuang to Qingshan;

Travel speed from Wangjiazhuang to Xiushui.

P80

Thinking: x-4=29, according to the property of equation 1

P8 1

Thinking: x=2000.

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