6.4*23.78-3.2*13.78怎么简便预算

6.4*23.78-3.2*13.78怎么简便预算

6.4× 23.78-3.2×13.78
=6.4×（10+13.78）-3.2×13.78
=6.4×10+6.4×13.78-3.2×13.78
=64+13.78×（6.4-3.2）
=64+13.78×3.2
=64+13.78×3+13.78×0.2
=64+41.34+2.756
=64+44.096
=108.096追答这题简算也麻烦。谢谢

=3.2*2*23.78-3.2*13.78=3.2*(23.78+23.78-13.78)=3.2*33.78=(3+0.2)*33.78=3*33.78+0.2*33.78=101.34+6.756=108.096

6.4*23.78-3.2*13.78
=3.2*（2*23.78-13.78）
=3.2*[2*（13.78+10）-13.78]
=3.2*（2*13.78-13.78+20）
=3.2*（13.78+20）
=3.2*33.78
=（3+0.2）（34-0.22）
=102+6.8-0.66-0.044
=108.8-0.704
=108.096

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