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Whoever can solve this math problem will be given a math problem of grade one, and only he can explain it.
From the picture, we can see that

The first picture: box+circle =3

The second picture: circle-box = 1

therefore

Box = 1, circle =2.

The third picture: box+triangle =6

So triangle =6- 1=5.

The fourth picture: triangular box =5- 1=4.

The fifth picture: triangle-circle =5-2=3