问题 解答题
脱式计算.
①6.4÷(0.3×2+0.2)②68.1-77.7÷0.7×0.5③3.5×5.2+0.35×48④3.08÷[1.6×(3.8-2.05)].
答案

①6.4÷(0.3×2+0.2),

=6.4÷0.8,

=8;

②68.1-77.7÷0.7×0.5,

=68.1-55.5,

=12.6;

③3.5×5.2+0.35×48,

=0.35×52+0.35×48,

=0.35×(52+48),

=35;

④3.08÷[1.6×(3.8-2.05)],

=3.08÷[1.6×(3.8-2.05)],

=3.08÷2.8,

=1.1.

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