问题 解答题
(1)79.76+84.7×0.2(2)15.37+28.44+12.56
(3)(2.3×8.8-2.3×0.8)×1.25(4)[5.2-(2.5+7.5÷5)]×1.2.
答案

(1)79.76+84.7×0.2,

=79.76+16.94,

=96.7;

(2)15.37+28.44+12.56,

=15.37+(28.44+12.56),

=15.37+41,

=56.37;

(3)(2.3×8.8-2.3×0.8)×1.25,

=2.3×(8.8-0.8)×1.25,

=2.3×8×1.25,

=2.3×(8×1.25),

=2.3×10,

=23;

(4)[5.2-(2.5+7.5÷5)]×1.2,

=[5.2-(2.5+1.5)]×1.2,

=[5.2-4]×1.2,

=1.2×1.2,

=1.44.

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