5.7+3.22+3.3+1.78=5.7+3.3+(3.22+1.78)=9+5=14
你好,这道题使用加法的交换律:a+b+c=a+c+b。所以原式等于(5.7+3.3)+(3.22+1.78)=9+5=14。
5.7+3.22+3.3+1.78=5.7+3.3+3.22+1.78=9+514
5.7+3.3=9,3.22+1.78=5。9+5=14
5.7+3.22+3.3+1.78=5.7+3.3+3.22+1.78=9+5=14。