用简便方法计算.(1)56× 56 57 (2)3.3× 3 4 +0.75

用简便方法计算.(1)56× 56 57 (2)3.3× 3 4 +0.75×5.7+75%

(1)56×
56
57

=(57-1)×
56
57

=57×
56
57
-1×
56
57

=56 -
56
57

=55
1
57


(2)3.3×
3
4
+0.75×5.7+75%,
=(3.3+5.7+1)×0.75,
=10×0.75,
=7.5.
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