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18-(15.2-2.1)简算计算? 18 15%解析

18-(15.2-2.1)简算计算?18 15%解析

18(1/6+1/2+1/2)简便计算

18×(1/6+1/2+1/2)简便计算

=18×1/6+18×1/2+18×1/2

=3+9+9

=12+9

=21

15.2×21-2×2.1用简算

15.2×21-2×2.1

=2.1x(152-2)

=2.1x150

=(2+0.1)x150

=315

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18-(15分之1+21分之1)x105 用简便运算

18-(1/15+1/21)*105

18-(1/15+1/21)*5*21

18-(1/15 *5*2+1/21 *5*31)

18-(7+5)

6

60×(5/18+4/15-1/2)=简便运算

60×(5/18+4/15-1/2)

=60*5/18+60*4/15-60*1/2

=50/3+16-30

=16+16-30+2/3

=2又2/3

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