29x0.8 2.9x4.5 0.29x17的简便运算。
2个回答
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原式
=2.9×8+2.9×4.5+2.9×1.7
=2.9×(8+4.5+1.7)
=2.9×14
=(3-0.1)×14
=3×14-0.1×14
=42-1.4
=40.6
=2.9×8+2.9×4.5+2.9×1.7
=2.9×(8+4.5+1.7)
=2.9×14
=(3-0.1)×14
=3×14-0.1×14
=42-1.4
=40.6
追答
原式
=2.9×8+2.9×4.5+2.9×1.7
=2.9×(8+4.5+1.7)
=2.9×14.2
=(3-0.1)×14.2
=3×14.2-0.1×14.2
=42.6-1.42
=40.18
纠正了一下
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