问题 解答题

(1)(2.61+3.79)×2.7

(2)80.8×1.25

(3)0.125×3.9×16

(4)5.6×(10-9.2)+6.98

(5)7.3×9.8+0.2×7.3

(6)[2.75+8.4÷(9.2-6.8)]×30.

答案

(1)(2.61+3.79)×2.7,

=6.4×2.7,

=17.28;

(2)80.8×1.25,

=80×1.25+0.8×1.25,

=100+1,

=101;

(3)0.125×3.9×16,

=(0.125×8)×(2×3.9),

=1×7.8,

=7.8;

(4)5.6×(10-9.2)+6.98,

=5.6×0.8+6.98,

=4.48+6.98,

=11.46;

(5)7.3×9.8+0.2×7.3,

=(9.8+0.2)×7.3,

=10×7.3,

=73;

(6)[2.75+8.4÷(9.2-6.8)]×30,

=[2.75+8.4÷2.4]×30,

=[2.75+3.5]×30,

=6.25×30,

=187.5.

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