灵鹊做题网12.34减4.54减5.46简便,0.98乘7.2简便 1.02乘6.5简便 （8减0.8）乘1.25简便 18.8乘
来源：学生作业帮 编辑：灵鹊做题网作业帮 分类：数学作业 时间：2024/04/26 20:12:59
12.34减4.54减5.46简便,0.98乘7.2简便 1.02乘6.5简便 （8减0.8）乘1.25简便 18.8乘101减18.8简便
5.12加5,12乘9 简便 3.15乘1.6加1.85乘1.6简便
5.12加5,12乘9 简便 3.15乘1.6加1.85乘1.6简便
12.34-4.54-5.46
=12.34-(4.54+5.46)
=12.34-10
=2.34
0.98×7.2
=(1-0.02)×7.2
=1×7.2-0.02×7.2
=7.2-0.144
=7.056
1.02×6.5
=(1+0.02)×6.5
=1×6.5+0.02×6.5
=6.5+0.13
=6.63
(8-0.8)×1.25
=8×1.25-0.8×1.25
=10-1
=9
18.8×101-18.8
=18.8×(101-1)
=18.8×100
=1880
5.12+5.12×9
=5.12×(1+9)
=5.12×10
=51.2
3.15×1.6+1.85×1.6
=(3.15+1.85)×1.6
=5×1.6
=8
=12.34-(4.54+5.46)
=12.34-10
=2.34
0.98×7.2
=(1-0.02)×7.2
=1×7.2-0.02×7.2
=7.2-0.144
=7.056
1.02×6.5
=(1+0.02)×6.5
=1×6.5+0.02×6.5
=6.5+0.13
=6.63
(8-0.8)×1.25
=8×1.25-0.8×1.25
=10-1
=9
18.8×101-18.8
=18.8×(101-1)
=18.8×100
=1880
5.12+5.12×9
=5.12×(1+9)
=5.12×10
=51.2
3.15×1.6+1.85×1.6
=(3.15+1.85)×1.6
=5×1.6
=8
12.34减4.54减5.46简便,0.98乘7.2简便 1.02乘6.5简便 （8减0.8）乘1.25简便 18.8乘
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