按照运算规则进行按部就班的运算,就是最简便的运算;
552÷23×19-260
=24×19-260
=456-260
=196
=14×19-260=14×(20-1)-260=280-14-260=20-14=6
=14×19-260
=14×(20-1)-260
=280-14-260
=20-14
=6
552÷23×19-260
=24×(20-1)-260
=480-24-260
=480-260-24
=220-(20+4)
=220-20-4
=200-4
=196
=24×19-260
=24×20-260-24
=480-260-24
=220-24
=196