4.7×5.69+5.3×5的简便运算？
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4.7×5.69+5.3×5
=4.7×5.69+5.3×(5.69-0.69)
=4.7×5.69+5.3×5.69-5.3x0.69
=5.69x(4.7+5.3)-5.3x(0.7-0.01)
=5.69x10-5.3x0.7+5.3x0.01
=56.9-3.71+0.053
=53.19+0.053
=53.243。
=4.7×5.69+5.3×(5.69-0.69)
=4.7×5.69+5.3×5.69-5.3x0.69
=5.69x(4.7+5.3)-5.3x(0.7-0.01)
=5.69x10-5.3x0.7+5.3x0.01
=56.9-3.71+0.053
=53.19+0.053
=53.243。
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