20一4.56十3.44用简便方法怎么做
2个回答
展开全部
(1)9.7+10.3-6.7
=(9.7+10.3)-6.7
=20-6.7
=13.3;
(2)13.56-(4.56+3.44)
=13.56-4.56-3.44
=9-3.44
=5.56;
(3)13.25+5.72+6.75+4.18
=(13.25+6.75)+(5.72+4.18)
=20+9.9
=29.9;
(4)3.28-(1.2-3.6)
=3.28-1.2+3.6
=2.08+3.6
=5.68;
(5)19.1-4.3-5.7
=19.1-(4.3+5.7)
=19.1-10
=9.1;
(6)23.1+59.78+6.9
=23.1+6.9+59.78
=30+59.78
=89.78.
=(9.7+10.3)-6.7
=20-6.7
=13.3;
(2)13.56-(4.56+3.44)
=13.56-4.56-3.44
=9-3.44
=5.56;
(3)13.25+5.72+6.75+4.18
=(13.25+6.75)+(5.72+4.18)
=20+9.9
=29.9;
(4)3.28-(1.2-3.6)
=3.28-1.2+3.6
=2.08+3.6
=5.68;
(5)19.1-4.3-5.7
=19.1-(4.3+5.7)
=19.1-10
=9.1;
(6)23.1+59.78+6.9
=23.1+6.9+59.78
=30+59.78
=89.78.
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