Question

7.3*14.2-4.2怎么简便计算?

Answer 1

7.3*14.2-4.2怎么简便计算?

7.3 x (10+ 4.2 ) - 4.2

= 7.3 x 10 + 7.3x4.2 - 1x 4.2

= 73 + (7.3-1) x 4.2

= 73 + 6.3 x 4.2

= 73 +26.46

=99.46

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