14.9一(5.2×4.9)的简便运算?
3个回答
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计算如下:
14.9-(5.2×4.9)
=14.9-(5×4.9+0.2×4.9)
=14.9-(4.9×10/2+0.2×4.9)
=14.9-(24.5+0.98)
=14.9-24.5-0.9-0.08
=14-24.5-0.08
=14-24.58
=-10.58
14.9-(5.2×4.9)
=14.9-(5×4.9+0.2×4.9)
=14.9-(4.9×10/2+0.2×4.9)
=14.9-(24.5+0.98)
=14.9-24.5-0.9-0.08
=14-24.5-0.08
=14-24.58
=-10.58
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14.9-(5.2×4.9)
=10+4.9-4.9×5.2
=10+4.9(1-5.2)
=10+4.9×(-4.2)
=10-20.58
=-10.58
=10+4.9-4.9×5.2
=10+4.9(1-5.2)
=10+4.9×(-4.2)
=10-20.58
=-10.58
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