Exercise $A$ Copy the problems. Find the products by multiplying the factors in parentheses first.
1) $(3 \cdot 5) 20=3(5 \cdot 20)$
6) $(25 \cdot 4) 9=25(4 \cdot 9)$
2) $4(6 \cdot 10)=(4 \cdot 6) 10$
7) $17(5 \cdot 2)=(17 \cdot 5) 2$
3) $[5(4 \cdot 13)]=[(5 \cdot 4) 13]$
8) $[(14 \cdot 10) 2]=[14(10 \cdot 2)]$
4) $8(2 \cdot 5)=(8 \cdot 2) 5$
9) $[20(5 \cdot 4)]=[(20 \cdot 5) 4]$
10) $8(15 \cdot 2)=(8 \cdot 15)^{2}$

Answer

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Answer

$ \boxed{\text{All the given equations are correct}} $

Steps

Step 1 ：Calculate the products by multiplying the factors in parentheses first for each equation.

Step 2 ：Compare the left side and right side of the equation to check if they are equal.

Step 3 ：$ \boxed{\text{All the given equations are correct}} $