6.8*4.2+5.8+5.8*5.8怎么巧算

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6.8*4.2+5.8+5.8*5.8怎么巧算
6.8*4.2+5.8+5.8*5.8怎么巧算

6.8*4.2+5.8+5.8*5.8怎么巧算
6.8*4.2+5.8+5.8*5.8
=6.8x4.2+5.8x(1+5.8)
=6.8x4.2+5.8x6.8
=6.8x(4.2+5.8)
=6.8x11
=6.8x(10+1)
=6.8x10+6.8x1
=68x6.8
=74.8