A difficult problem in finding the law in the sixth grade mathematics of primary school - Training Enrollment Network

A difficult problem in finding the law in the sixth grade mathematics of primary school

Question 1: B.

9+6-(4+8)=3

10+8-(5+7)=6

15+ 15-(0+ 1 1)=9

18+? -(12+13) =12, what? = 19

Add 3 to the obtained numbers in turn.

Question 2: C.

Molecule: add 4 in turn.

Denominator: Subtract 5, 4, 3 and 2 in turn.

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