Math problems in the first grade of primary school are very difficult.
Observe and get information: Apple must represent an even number; Pear is bigger than apple by 1, which belongs to carry addition.
Try to replace the numbers! 89+9=98
2.？ The observation shows that strawberry is bigger than peach, so give way to subtraction. Strawberry is bigger than peach by 2, both of which are even numbers.