18-(15.2-2.1)简算计算? 18 15%解析
更新时间:2022-03-17 20:06:17 • 作者:KRISTIN •阅读 6790
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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