两道简便运算7.2x4.6+46x0.289.8x3.6+7.2x0.1

来源：学生作业帮编辑：搜狗做题网作业帮分类：数学作业时间：2024/04/28 12:39:47

两道简便运算
7.2x4.6+46x0.28
9.8x3.6+7.2x0.1

7.2x4.6+46x0.28
=7.2x4.6+4.6x10x0.28
=7.2x4.6+4.6x2.8
=4.6x(7.2+2.8)
=4.6x10
=46
9.8x3.6+7.2x0.1
=9.8x3.6+3.6x2x0.1
=9.8x3.6+3.6x0.2
=3.6x(9.8+0.2)
=3.6x10
=36

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