立即下载 | 限时 免费 下载 |
同类热门下载
简介:
3.29+0.73+2.27 3.29-0.73-2.27
=3.29+(0.73+2.27) =3.29-(0.73+2.27)
=3.29-3 =3.29+3
=6.29 =0.29
(加法结合律) (减法的性质)
7.5+2.5-7.5+2.5 7.325-3.29-3.325
=(7.5-7.5)+(2.5+2.5) =7.325-3.325-3.29
=0+5 =4-3.29
=5 =0.71
(同级运算交换) (减法交换)
7.325-(5.325+1.7) 7.325-(5.325-1.7)
=7.325-5.325-1.7 =7.325-5.325+1.7
=2-1.7 =2+1.7
=0.3 =3.7
(减法的性质) (前面减号,脱括号变符号)