问题
解答题
2.47×6.5+7.53×6.5
0.65×101
4.12-1.78-1.22
3.6+6.4×1.5.
答案
(1)2.47×6.5+7.53×6.5,
=(2.47+7.53)×6.5,
=10×6.5,
=65;
(2)0.65×101,
=0.65×(100+1),
=0.65×100+0.65,
=65+0.65,
=65.65;
(3)4.12-1.78-1.22,
=4.12-(1.78+1.22),
=4.12-3,
=1.12;
(4)3.6+6.4×1.5,
=3.6+3.2×(2×1.5),
=3.6+3.2×3,
=3.6+9.6,
=13.2.