Question

【題目】計(jì)算。

2.44＋6.51＋1.2 6.11＋2.3＋5.1

1.23＋2.44＋4.9 2.16＋4.29＋2.1

Answer 1

【答案】10.15；13.51

8.57；8.55

【解析】

根據(jù)小數(shù)加法的計(jì)算法則進(jìn)行計(jì)算，先把這兩個數(shù)的小數(shù)點(diǎn)對齊，小數(shù)點(diǎn)對齊，相同數(shù)位上的數(shù)就對齊了，再按照整數(shù)加法的法則進(jìn)行計(jì)算，最后在得數(shù)里對齊橫線上的小數(shù)點(diǎn)點(diǎn)上小數(shù)點(diǎn)。運(yùn)算順序按整數(shù)連加的運(yùn)算順序進(jìn)行計(jì)算。

2.44＋6.51＋1.2

=8.95+1.2

=10.15

6.11＋2.3＋5.1

=8.41+5.1

=13.51

1.23＋2.44＋4.9

=3.67+4.9

=8.57

2.16＋4.29＋2.1

=6.45+2.1

=8.55