乘法分配律(a+b)×c=a×c+b×c乘法结合律(a×b)×c=a×(b×c)乘法交换律a×b=b×a加法结合律(a+b)+c=a+(b+c)求采纳！！！(づ￣3￣)づ
56+(384+144)=(56+144)+384=200+384=584
=（56+144）+384
56+(384+144）=56+144+384=200+384=584
=(56+144)+384=200+384=584
