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The third question on page 64 of the sixth grade mathematics volume II of People's Education Press.
Hello, landlord, I'm also in grade six.

1, in direct proportion, the distance on the map ÷ the actual distance = scale (certain).

2, inversely proportional, divisor × quotient = dividend (certain)

3. In direct proportion, S=(a+b)h÷2 S÷h=(a+b) half (certain).

4, in direct proportion, y÷x=5 (certain)