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问题: 巧算

784070+78407.1+7840.72+784.073+78.407=?
这道题的巧算步骤

解答:

784070+78407.1+7840.72+784.073+78.407
=700000+70000+7000+700+70+80000…………
=777770+88888+4444.4+77.777+0.123
=777770+22230+66658+4444.4+77.9
=800000+66658+3342+1102.4+77.9
=800000+70000+1180.3
=871180.3