0.8+0.88+0.888+0.8888+0.2222(简便)

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0.8+0.88+0.888+0.8888+0.2222(简便)
0.8+0.88+0.888+0.8888+0.2222(简便)

0.8+0.88+0.888+0.8888+0.2222(简便)
0.8+0.88+0.888+0.8888+0.2222
=0.8+0.88+0.888+0.8888+0.2+0.02+0.002+0.0002
=(0.8+0.2)+(0.88+0.02)+(0.888+0.002)+(0.8888+0.0002)
=0.9+0.9+0.89+0.889
=0.9+0.9+0.9-0.01+0.9-0.011
=0.9×4-0.021
=3.6-0.021
=3.579