0.5和0.50大小相等,它们的计数单位也相同,对吗

2024-11-13 21:14:54
推荐回答(2个)
回答1:

0.5和0.50大小相等,它们的计数单位也相同,
不对,
0.5和0.50大小虽然相等,但它们的计数单位不相同。
0.5的计数单位是0.1,0.50的计数单位是0.01,

回答2:

同学们好:
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学动结合,健康成长!

【管理员】数学-毛老师 2020/5/19 7:59:07
同学们好:
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8:00:52
【管理员】数学-毛老师 2020/5/19 8:00:52
课前复习:
①1是( ),1.0是( )。
1是自然数,1.0是小数。
②1=1.0,但1和1.0表示的意义有所不同,例如用四舍五入法保留得数是1,那么原数在0.5和1.4之间(包括0.5和1.4)如果用四舍五入法保留得数是1.0,那么原数在0.95和1.04之间(包括0.95和1.04)显然0.5≠0.95,1.4≠1.04。
1是自然数,它的计数单位是一(个),表示1个一;1.0是小数,它的计数单位是十分之一,也可以说是0.1,1.0表示10个十分之一,也就是10个0.1。
③把1.0写成1,即1.0=1,是去掉小数未尾的O,这是把小数化简;把1写成1.0,即1=1.0,这是数的改写,即把自然数改写成了一位小数,若写成1=1.00,则是把1改写成了两位小数。在实际计算时,有时需要化简小数,如3.06十12.14=15.20=15.2
有时需要数的改写,便于计算
如计算2一1.3写竖式时,往住把2写成2.0方便小数点的对齐。
2一1.3=0.7
2.0
一1.3
_______
0.7

【管理员】数学-毛老师 2020/5/19 8:01:32
③计算小数加减法,一定要把小数点对齐,小数点对齐,实际是数位对齐,然后再按照整数加减法的计算法则进行计算就行了。
【管理员】数学-毛老师 2020/5/19 8:01:43
④计算结果要把小数化简。
【管理员】数学-毛老师 2020/5/19 8:02:37
⑤计算要细心,确保一次性正确,若不能一次性正确,就是计算不过关。
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