Mathematics in the third grade of primary school, Book 1, synchronous exercises before and after class. The last question on page 15, what should I do to develop exercises?
There is a mistake in the printing of this topic. The square on the 100th place of its molecule should be changed to a circle, so its molecules should be respectively; Square equals 4, circle equals 5 and triangle equals 9.
This is what I learned after contacting the publishing house. This is absolutely true.