Question

72x2.09-1.8x73.6的简便算法

Answer 1

72x2.09-1.8x73.6

=72x2.09-1.8x72-1.8x1.6

=72x(2.09-1.8)-18x0.16

=72x0.29-72x0.04

=72x(0.29-0.04)

=72x0.25

=18x4x0.25

=18x1

=18

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