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简便运算7.2×0.2+2.4×1.4 2.3×16+2.3×23+2.3 2.22×9.9+6.66×6.7

来源:学生作业帮 编辑:作业帮 分类:数学作业 时间:2024/05/01 00:48:14
简便运算7.2×0.2+2.4×1.4 2.3×16+2.3×23+2.3 2.22×9.9+6.66×6.7
7.2×0.2+2.4×1.4
=2.4×0.6+2.4×1.4
=2.4×(0.6+1.4)
=2.4×2
=4.8
2.3×16+2.3×23+2.3
=2.3×(16+23+1)
=2.3×40
=92
2.22×9.9+6.66×6.7
=6.66×3.3+6.66×6.7
=6.66×(3.3+6.7)
=6.66×10
=66.6