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Four Arithmetic Operation, Subtraction, Multiplication, Disivion, a+0=a, a…

- - - - e.g. 75+25=100
  - - - That means "addend 1+addend 2=sum"
- - - - e.g. 5×4-6÷2=17 Step：① 5×4=20 ② 6÷2=3 ③ 20-3=17
  - - - Step 1: First, perform the multiplication and division from left to right. 8×7=56, and 10÷2=5
        Step 2:Then, perform addition and subtraction from left to right. 56-5=51
        
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