4.99+4.99+4.99+0.04+4.99用递等式计算

4.99+4.99+4.99+0.04+4.99用递等式计算
4.99+4.99+4.99+0.04+4.99用递等式计算

4.99+4.99+4.99+0.04+4.99用递等式计算
4.99+4.99+4.99+0.04+4.99
原式=4.99+4.99+4.99+4.99+0.01+0.01+0.01+0.01
=(4.99+0.01)+(4.99+0.01)+(4.99+0.01)+(4.99+0.01)
=5+5+5+5
=20
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