简便计算(1)15.25+4.72+4.75+5.28(2)12.7-4.8-5.2(3)34.82-(4.82+15.2)(4)9.85+4.9-7.85(5)8
简便计算(1)15.25+4.72+4.75+5.28(2)12.7-4.8-5.2(3)34.82-(4.82+15.2)(4)9.85+4.9-7.85(5)8.64...
简便计算(1)15.25+4.72+4.75+5.28(2)12.7-4.8-5.2(3)34.82-(4.82+15.2)(4)9.85+4.9-7.85(5)8.64-2.4+2.36-1.6(6)3.1+25.78+6.9.
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(1)15.25+4.72+4.75+5.28
=(15.25+4.75)+(4.72+5.28)
=20+10
=30
(2)12.7-4.8-5.2
=12.7-(4.8+5.2)
=12.7-10
=2.7
(3)34.82-(4.82+15.2)
=34.82-4.82-15.2
=30-15.2
=14.8
(4)9.85+4.9-7.85
=(9.85-7.85)+4.9
=2+4.9
=6.9
(5)8.64-2.4+2.36-1.6
=(8.64+2.36)-(2.4+1.6)
=11-4
=7
(6)3.1+25.78+6.9
=(3.1+6.9)+25.78
=10+25.78
=35.78
=(15.25+4.75)+(4.72+5.28)
=20+10
=30
(2)12.7-4.8-5.2
=12.7-(4.8+5.2)
=12.7-10
=2.7
(3)34.82-(4.82+15.2)
=34.82-4.82-15.2
=30-15.2
=14.8
(4)9.85+4.9-7.85
=(9.85-7.85)+4.9
=2+4.9
=6.9
(5)8.64-2.4+2.36-1.6
=(8.64+2.36)-(2.4+1.6)
=11-4
=7
(6)3.1+25.78+6.9
=(3.1+6.9)+25.78
=10+25.78
=35.78
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