5.2×0.9+0..9的简便运算

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5.2×0.9+0..9的简便运算5.2×0.9+0..9的简便运算5.2×0.9+0..9的简便运算5.2×0.9+0.9=0.9*(5.2+1)=1*6.2-0.1*6.2=6.2-0.62=5.

5.2×0.9+0..9的简便运算
5.2×0.9+0..9的简便运算

5.2×0.9+0..9的简便运算
5.2 ×0.9+0.9
=0.9*(5.2+1)
=1*6.2-0.1*6.2
=6.2-0.62
=5.58

5.2×0.9+0.9
=(5.2+1)×0.9
=6.2×0.9
=6.2×(1-0.1)
=6.2×1-6.2×0.1
=5.58

=5.58