问题 解答题
计算:
①2.5×7+3×2.5

②12.6-1.8-4.1-4.1

③63÷4.5÷0.2
④0.15×(7.8-2.8)×6⑤7.52÷[(0.54-0.38)×4.7].
答案

①2.5×7+3×2.5,

=2.5×(7+3),

=2.5×10,

=25;

②12.6-1.8-4.1-4.1,

=12.6-(1.8+4.1+4.1),

=12.6-10,

=2.6;

③63÷4.5÷0.2,

=63÷(4.5×0.2),

=63÷0.9,

=70;

④0.15×(7.8-2.8)×6,

=0.15×5×6,

=4.5;

⑤7.52÷[(0.54-0.38)×4.7],

=7.52÷[0.16×4.7],

=7.52÷0.752,

=10.

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