8*6.9+2.6*79.3简便算

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8*6.9+2.6*79.3简便算

7.8×6.9+2.6×79.3
=（2.6×3）×6.9+2.6×79.3
=2.6×20.7+2.6×79.3
=2.6×（20.7+79.3）
=2.6×100
=260

7.8×6.9+2.6×79.3
=（2.6×3）×6.9+2.6×79.3
=2.6×20.7+2.6×79.3
=2.6×（20.7+79.3）
=2.6×100
=260

=2.6*3*6.9+2.6*79.3
=2.6*3*(7-0.1)+2.6*79.3
=2.6*(21-0.3)+2.6*79.3
=2.6*20.7+2.6*79.3
=2.6*(20.7+79.3)
=2.6*100
=260

vcv

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