用简便方法计算.4.45+0.63+5.555.28-(2.9+1.28)5.25+7.86-2.86+4.750.96一0.28+0.04一0.72.
答案:2 悬赏:10 手机版
解决时间 2021-01-04 04:04
- 提问者网友:我一贱你就笑
- 2021-01-03 14:55
用简便方法计算. 4.45+0.63+5.555.28-(2.9+1.28)5.25+7.86-2.86+4.750.96一0.28+0.04一0.72.
最佳答案
- 五星知识达人网友:街头电车
- 2021-01-03 16:27
解:(1)4.45+0.63+5.55,
=4.45+5.55+0.63,
=10+0.63,
=10.63;
(2)5.28-(2.9+1.28),
=5.28-1.28-2.9,
=4-2.9,
=1.1;
(3)5.25+7.86-2.86+4.75,
=(5.25+4.75)+(7.86-2.86),
=10+5,
=15;
(4)0.96-0.28+0.04-0.72,
=(0.96+0.04)-(0.28+0.72),
=1-1,
=0.解析分析:(1)运用加法交换律简算;
(2)根据减法的性质简算;
(3)根据加法交换律和结合律简算;
(4)根据加法结合律和减法的性质简算.点评:此题考查小数的加减混合运算,要仔细观察算式的特点,灵活运用一些定律进行简便计算.
=4.45+5.55+0.63,
=10+0.63,
=10.63;
(2)5.28-(2.9+1.28),
=5.28-1.28-2.9,
=4-2.9,
=1.1;
(3)5.25+7.86-2.86+4.75,
=(5.25+4.75)+(7.86-2.86),
=10+5,
=15;
(4)0.96-0.28+0.04-0.72,
=(0.96+0.04)-(0.28+0.72),
=1-1,
=0.解析分析:(1)运用加法交换律简算;
(2)根据减法的性质简算;
(3)根据加法交换律和结合律简算;
(4)根据加法结合律和减法的性质简算.点评:此题考查小数的加减混合运算,要仔细观察算式的特点,灵活运用一些定律进行简便计算.
全部回答
- 1楼网友:神也偏爱
- 2021-01-03 17:04
谢谢回答!!!
我要举报
如以上问答信息为低俗、色情、不良、暴力、侵权、涉及违法等信息,可以点下面链接进行举报!
大家都在看
推荐资讯