问题
解答题
若a=5.6,b=3.6,求下列各式的值.
2ab
5a+3b
2.6b-1.2a.
答案
(1)2ab,
=2×5.6×3.6,
=40.32;
(2)5a+3b,
=5×5.6+3×3.6,
=28+10.8,
=38.8;
(3)2.6b-1.2a,
=2.6×3.6-1.2×5.6,
=9.36-6.72,
=2.64.
若a=5.6,b=3.6,求下列各式的值.
2ab
5a+3b
2.6b-1.2a.
(1)2ab,
=2×5.6×3.6,
=40.32;
(2)5a+3b,
=5×5.6+3×3.6,
=28+10.8,
=38.8;
(3)2.6b-1.2a,
=2.6×3.6-1.2×5.6,
=9.36-6.72,
=2.64.