问题
解答题
下面怎样算简便就怎样算.
[9.08-(8.61+0.47)]÷3.09
4.2+0.8×(17.28÷4.8)
23.08-1.5×0.5-0.25
8.9×10.1
3.8×0.65÷3.8×0.65.
答案
(1)[9.08-(8.61+0.47)]÷3.09,
=[9.08-9.08]÷3.09,
=0÷3.09,
=0;
(2)4.2+0.8×(17.28÷4.8),
=4.2+0.8×3.6,
=4.2+2.88,
=7.08;
(3)23.08-1.5×0.5-0.25,
=23.08-0.75-0.25,
=23.08-(0.75+0.25),
=23.08-1,
=22.08;
(4)8.9×10.1,
=8.9×(10+0.1),
=8.9×10+8.9×0.1,
=89+0.89,
=89.89;
(5)3.8×0.65÷3.8×0.65,
=2.47÷3.8×0.65,
=0.65×0.65,
=0.4225.