用简便方法计算下面各题 13.6-1.8-3.213.7+1.98+0.02+5.35.1+0.9-5.1+0.936×9910.75+0.4+0.2538.14-5.46
用简便方法计算下面各题13.6-1.8-3.213.7+1.98+0.02+5.35.1+0.9-5.1+0.936×9910.75+0.4+0.2538.14-5.46...
用简便方法计算下面各题 13.6-1.8-3.213.7+1.98+0.02+5.35.1+0.9-5.1+0.936×9910.75+0.4+0.2538.14-5.46-4.5418.51-9.03-0.9732+6.4+68+3.615.5+26.5-20.41O.27+0.4-8.2724.6-3.98+5.4-6.0264.3-18.75+15.7-11.25.
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(1)13.6-1.8-3.2
=13.6-(1.8+3.2)
=13.6-5
=8.6
(2)13.7+1.98+0.02+5.3
=(13.7+5.3)+(1.98+0.02)
=19+2
=21
(3)5.1+0.9-5.1+0.9
=(5.1-5.1)+(0.9+0.9)
=0+1.8
=1.8
(4)36×99
=36×(100-1)
=36×100-36
=3600-36
=3564
(5)10.75+0.4+0.25
=10.75+0.25+0.4
=11+0.4
=11.4
(6)38.14-5.46-4.54
=38.14-(5.46+4.54)
=38.14-10
=28.14
(7)18.51-9.03-0.97
=18.51-(9.03+0.97)
=18.51-10
=8.51
(8)32+6.4+68+3.6
=(32+68)+(6.4+3.6)
=100+10
=110
(9)15.5+26.5-20.4
=42-20.4
=21.6
(10)1O.27+0.4-8.27
=1O.27-8.27+0.4
=2+0.4
=2.4
(11)24.6-3.98+5.4-6.02
=(24.6+5.4)-(6.02+3.98)
=30-10
=20
(12)64.3-18.75+15.7-11.25
=(64.3+15.7)-(11.25+18.75)
=80-30
=50
=13.6-(1.8+3.2)
=13.6-5
=8.6
(2)13.7+1.98+0.02+5.3
=(13.7+5.3)+(1.98+0.02)
=19+2
=21
(3)5.1+0.9-5.1+0.9
=(5.1-5.1)+(0.9+0.9)
=0+1.8
=1.8
(4)36×99
=36×(100-1)
=36×100-36
=3600-36
=3564
(5)10.75+0.4+0.25
=10.75+0.25+0.4
=11+0.4
=11.4
(6)38.14-5.46-4.54
=38.14-(5.46+4.54)
=38.14-10
=28.14
(7)18.51-9.03-0.97
=18.51-(9.03+0.97)
=18.51-10
=8.51
(8)32+6.4+68+3.6
=(32+68)+(6.4+3.6)
=100+10
=110
(9)15.5+26.5-20.4
=42-20.4
=21.6
(10)1O.27+0.4-8.27
=1O.27-8.27+0.4
=2+0.4
=2.4
(11)24.6-3.98+5.4-6.02
=(24.6+5.4)-(6.02+3.98)
=30-10
=20
(12)64.3-18.75+15.7-11.25
=(64.3+15.7)-(11.25+18.75)
=80-30
=50
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