作业帮0.9999乘0.7加0.1111乘2.7是多少?
来源：学生作业帮 编辑：作业帮 分类：数学作业 时间：2024/11/08 19:27:11
0.9999乘0.7加0.1111乘2.7是多少?
还有：7.5乘2.7加1.9乘2.5和8.4乘2.9减1.6乘2.1
还有：7.5乘2.7加1.9乘2.5和8.4乘2.9减1.6乘2.1
0.9999×0.7+0.1111×2.7
=0.1111×9×0.7+0.1111×2.7
=0.1111×6.3+0.1111×2.7
=0.1111×(6.3+2.7)
=0.1111×9
=0.9999
7.5×2.7+1.9×2.5
=2.5×3×2.7+1.9×2.5
=2.5×8.1+1.9×2.5
=2.5×(8.1+1.9)
=2.5×10
=25
8.4×2.9-1.6×2.1
=8.4×2.9-(10-8.4)×2.1
=8.4×2.9-10×2.1+8.4×2.1
=8.4×(2.9+2.1)-21
=8.4×5-21
=42-21
=21
=0.1111×9×0.7+0.1111×2.7
=0.1111×6.3+0.1111×2.7
=0.1111×(6.3+2.7)
=0.1111×9
=0.9999
7.5×2.7+1.9×2.5
=2.5×3×2.7+1.9×2.5
=2.5×8.1+1.9×2.5
=2.5×(8.1+1.9)
=2.5×10
=25
8.4×2.9-1.6×2.1
=8.4×2.9-(10-8.4)×2.1
=8.4×2.9-10×2.1+8.4×2.1
=8.4×(2.9+2.1)-21
=8.4×5-21
=42-21
=21
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