问题
解答题
0.46×7.5+0.46×2.5
3-7.14÷3.5×1.05
9.9×8.6+0.86
[20-(90.75÷6.6+2.25)]×11.6.
答案
①0.46×7.5+0.46×2.5,
=0.46×(7.5+2.5),
=0.46×10,
=4.6;
②3-7.14÷3.5×1.05,
=3-2.04×1.05,
=3-2.142,
=0.858;
③9.9×8.6+0.86,
=99×0.86+0.86,
=0.86×(99+1),
=0.86×100,
=86;
④[20-(90.75÷6.6+2.25)]×11.6,
=[20-(13.75+2.25)]×11.6,
=[20-16]×11.6,
=4×11.6,
=46.4.