Since there are no negative numbers in primary schools, the square or circle of the first number is 1, 2 or the sum of 0 and 3.
As determined in the second figure, add 1, 2, so the triangle represents 5 or 4.
According to the fourth figure, the triangle is 5, the square is 1 and the circle is 2.
5+2=7
This is 1 grade math, so we should do it carefully according to 1 grade. The 1 level has not involved the mathematics of logic and derivation, and it can't be done according to normal thinking. Fig. 5○ In△, it is proved that△ is greater than△; (Note: there is no negative number in the first grade) (I actually asked my niece)
Figure 3 has small delta and large □, figure 1 has small χ and large □, figure 3- figure 1= small delta- small χ = 3.
Figures 4 and 2 can prove this point. Figure 4 has the size delta, Figure 2 has the size delta, Figure 4- Figure 2= big delta- big delta = 3.
Such reasons and proofs are complete.
This topic is only suitable for people who have just started to prove mathematics in grade one. People who have studied negative numbers, logic and derivative are not easy to do. Because of this, the purpose of the question is to investigate whether the homework of students in grade 1 depends on their parents.