问题
解答题
脱式计算.(能简算的要简算)
12.56-6.64-3.36
45.5-(0.98+5.5)13.6+7.94+6.4
15.19+3.36+4.64+4.81.
答案
(1)12.56-6.64-3.36,
=12.56-(6.64+3.36),
=12.56-10,
=2.56;
(2)45.5-(0.98+5.5),
=45.5-0.98-5.5,
=45.5-5.5-0.98,
=40-0.98,
=39.02;
(3)13.6+7.94+6.4,
=(13.6+6.4)+7.94,
=20+7.94,
=27.94;
(4)15.19+3.36+4.64+4.81,
=(15.19+4.81)+(3.36+4.64),
=20+8,
=28.