Question

2.8×7.5-4.2×2.75 简算

Answer 1

2.8×7.5-4.2×2.75

=1.4x2x7.5-1.4x3x2.75

=1.4x(15-8.25)

=1.4x6.75

=0.8x2x6.75

=0.8x13.5

=0.8x12.5+0.8

=10+0.8

=10.8

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