下面各题怎样算简便就怎样算.18.51-9.03-0.97 32+6.4十68十3.6 4.56+...
下面各题怎样算简便就怎样算.18.51-9.03-0.9732+6.4十68十3.64.56+0.056+0.4415.5十26.5一20.410.27十0.4-8.27...
下面各题怎样算简便就怎样算.18.51-9.03-0.97 32+6.4十68十3.6 4.56+0.056+0.44 15.5十26.5一20.4 10.27十0.4-8.27 89.44+9.99 13.05+12.38-4.05 5.6-0.71-0.29 12.25+36+7.75 7.65+3.72+6.35+6.28 13.65-(3.65+8.5) 15.66-3.98
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(1)18.51-9.03-0.97
=18.51-(9.03+0.97)
=18.51-10
=8.51
(2)32+6.4+68+3.6
=(32+68)+(6.4+3.6)
=100+10
=110
(3)4.56+0.056+0.44
=4.56+0.44+0.056
=5+0.056
=5.056
(4)15.5+26.5-20.4
=42-20.4
=21.6
(5)10.27+0.4-8.27
=10.27-8.27+0.4
=2+0.4
=2.4
(6)89.44+9.99
=89.44+(10-0.01)
=89.44+10-0.01
=99.44-0.01
=99.43
=5.6-(0.71+0.29)
=5.6-1
=4.6
(9)12.25+36+7.75
=12.25+7.75+36
=20+36
=56
(10)7.65+3.72+6.35+6.28
=(7.65+6.35)+(6.28+3.72)
=14+10
=24
(11)13.65-(3.65+8.5)
=13.65-3.65-8.5
=10-8.5
=1.5
=18.51-(9.03+0.97)
=18.51-10
=8.51
(2)32+6.4+68+3.6
=(32+68)+(6.4+3.6)
=100+10
=110
(3)4.56+0.056+0.44
=4.56+0.44+0.056
=5+0.056
=5.056
(4)15.5+26.5-20.4
=42-20.4
=21.6
(5)10.27+0.4-8.27
=10.27-8.27+0.4
=2+0.4
=2.4
(6)89.44+9.99
=89.44+(10-0.01)
=89.44+10-0.01
=99.44-0.01
=99.43
(7)13.05+12.38-4.05 =13.05-4.05+12.38 =9+12.38 =21.38 (8)5.6-0.71-0.29 |
=5.6-1
=4.6
(9)12.25+36+7.75
=12.25+7.75+36
=20+36
=56
(10)7.65+3.72+6.35+6.28
=(7.65+6.35)+(6.28+3.72)
=14+10
=24
(11)13.65-(3.65+8.5)
=13.65-3.65-8.5
=10-8.5
=1.5
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