3.23+5.67
用简便方法计算下面各题.3.18+5.67+4.82+4.23;6.37-2.82-3.18;4.8-3.62-0.38+0.2;3.5+0.3-3.5+0.7....
用简便方法计算下面各题.
3.18+5.67+4.82+4.23;
6.37-2.82-3.18;
4.8-3.62-0.38+0.2;
3.5+0.3-3.5+0.7. 展开
3.18+5.67+4.82+4.23;
6.37-2.82-3.18;
4.8-3.62-0.38+0.2;
3.5+0.3-3.5+0.7. 展开
1个回答
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(1)3.18+5.67+4.82+4.23
=(3.18+4.82)+(4.23+5.67)
=8+10
=18
(2)6.37-(2.82+3.18)
=6.37-6
=0.37
(3)4.8-3.62-0.38+0.2
=(4.8+0.2)-(3.62+0.38)
=5-4
=1
(4)3.5+0.3-3.5+0.7
=(3.5-3.5)+(0.7+0.3)
=0+1
=1
=(3.18+4.82)+(4.23+5.67)
=8+10
=18
(2)6.37-(2.82+3.18)
=6.37-6
=0.37
(3)4.8-3.62-0.38+0.2
=(4.8+0.2)-(3.62+0.38)
=5-4
=1
(4)3.5+0.3-3.5+0.7
=(3.5-3.5)+(0.7+0.3)
=0+1
=1
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