问题 解答题

0.46×7.5+0.46×2.5

3-7.14÷3.5×1.05

9.9×8.6+0.86

[20-(90.75÷6.6+2.25)]×11.6.

答案

①0.46×7.5+0.46×2.5,

=0.46×(7.5+2.5),

=0.46×10,

=4.6;

②3-7.14÷3.5×1.05,

=3-2.04×1.05,

=3-2.142,

=0.858;

③9.9×8.6+0.86,

=99×0.86+0.86,

=0.86×(99+1),

=0.86×100,

=86;

④[20-(90.75÷6.6+2.25)]×11.6,

=[20-(13.75+2.25)]×11.6,

=[20-16]×11.6,

=4×11.6,

=46.4.

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