去括号:括号前面是减号,去掉括号要变号。因此:
47.63-(7.63-16.92)
=47.63-7.63+16.92
=40+16.92
=56.92
都有0.63的先算其减法,
47.63-(7.63-16.92)
=47.63-7.63+16.92
=40+16.92
=56.92
47.63-(7.63-16.92)
=47.63-7.63+16.92
=40+16.92
=56.92
47.63-(7.63-16.92)
=47.63-7.63+16.92
=40+16.92
=56.92
=47.63-7.63+16.92
=40+16.92
=56.92
应用去括号改变符号,可以使用简便。