(6.5-4.7)×2.75+0.9 简便运算.

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(6.5-4.7)×2.75+0.9简便运算.(6.5-4.7)×2.75+0.9简便运算.(6.5-4.7)×2.75+0.9简便运算.(6.5-4.7)×2.75+0.9=1.8×2.75+0.9

(6.5-4.7)×2.75+0.9 简便运算.
(6.5-4.7)×2.75+0.9 简便运算.

(6.5-4.7)×2.75+0.9 简便运算.
(6.5-4.7)×2.75+0.9
=1.8×2.75+0.9
=0.9×2×2.75+0.9
=0.9×(5.5+1)
=0.9×6.5
=6.5×(1-0.1)
=6.5-0.65
=5.85

=1.8*2.75+0.9
=4.95+0.9
=5.85

1.8×2.75+0.9
=4.95+0.9
=5.85

如果按这样简便运算还不如直接算快呢