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All quantitative relations and mathematical wide-angle solutions in grades 4 to 6 of People's Education Press.
Wide angle: the first volume of grade four: reasonable arrangement of time

Fourth grade book 2: planting trees

The first volume of grade five: coding, understanding the meaning of ID card, postal code, etc. , can be simple coding.

The fifth grade book: problem optimization, mainly looking for items, is to find out the one with different weights from a corresponding number of items.

The first volume of the sixth grade: chickens and rabbits in the same cage

Book for the sixth grade: pigeon coop principle.

Quantitative relationship: sixth grade: working hours * working efficiency = total workload.

Total amount of work ÷ work efficiency = working hours

Total workload ÷ working time = working efficiency

Speed × time = distance

Distance/speed = time

Distance/time = speed

Principal * interest rate = interest

Unit price * quantity = total price

Work efficiency * time = total workload.

Single output * quantity = total output

Number of copies * Number of copies = Total number Speed = Time * Distance

Principal * interest rate * time = interest

The main quantitative relationship in tree planting is: the number of intervals × the number of meters in each interval = a * * * * number of meters;

The main quantitative relationship of sawing wood is: times of sawing × time of sawing = time of sawing;

The quantitative relationship in the stair climbing problem is: the number of stairs ÷ the number of stairs between every two floors = the number of stairs.

The main relationship of the bell ringing problem is: the number of waiting times × the time of waiting once = the time of waiting once.

Survival rate = number of surviving trees/total number of trees

Qualified rate = qualified/total

Grade five: engineering problems:

Workload = work efficiency × required time;

Time required = workload ÷ work efficiency;

Work efficiency = workload ÷ required time

Travel problems:

Distance = speed × time;

Distance ÷ time = speed;

Distance/speed = time

Tap water problem:

Downstream stroke = (ship speed+water speed) × downstream time

Upstream stroke = (ship speed-water speed) × upstream time

Downstream speed = ship speed+current speed = ship speed-current speed.

Still water velocity = (downstream velocity+upstream velocity) ÷2

Recurrent engineering problems seem to be the focus.