求这几道简便计算题的做法! 5.555×5.2 2.22×3.33 7.658×85 36.02×0.3 56.78×8
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5.555×5.2=1.111×5×5.2=1.111×26=28.886
2.22×3.33 =1.11×2×3.33=(1+0.1+0.01)×6.66=6.66+0.666+0.0666=7.3926
7.658×85=7.658×(100-10-5)=765.8-76.58-38.29=650.93
36.02×0.3=(30+6+0.02)×0.3=9+1.8+0.006=10.806
56.78×8=56.78×(10-2)=567.8-113.56=454.24
2.22×3.33 =1.11×2×3.33=(1+0.1+0.01)×6.66=6.66+0.666+0.0666=7.3926
7.658×85=7.658×(100-10-5)=765.8-76.58-38.29=650.93
36.02×0.3=(30+6+0.02)×0.3=9+1.8+0.006=10.806
56.78×8=56.78×(10-2)=567.8-113.56=454.24
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