问题
解答题
用简便方法计算.
|
答案
①0.6+7.91+3.4+0.09,
=(0.6+3.4)+(7.91+0.09),
=4+8,
=12;
②
×3+1 2
×8-1 2
,1 2
=
×(3+8-1),1 2
=
×10,1 2
=5.
用简便方法计算.
|
①0.6+7.91+3.4+0.09,
=(0.6+3.4)+(7.91+0.09),
=4+8,
=12;
②
×3+1 2
×8-1 2
,1 2
=
×(3+8-1),1 2
=
×10,1 2
=5.