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.