问题
解答题
计算,能用简算的要简算.
0.85×101
5.29÷2.3-0.1×01
0.28÷35
8-4.68÷4.5×(0.25+0.5)
2.5×1.25×32
25.7×3.29+6.71×25.7.
答案
(1)0.85×101,
=0.85×(100+1),
=0.85×100+0.85×1,
=85+0.85,
=85.85;
(2)5.29÷2.3-0.1×01,
=2.3-0.01,
=2.29;
(3)0.28÷35,
=0.28÷7÷5,
=0.04÷5,
=0.008;
(4)8-4.68÷4.5×(0.25+0.5).
=8-4.68÷4.5×0.75,
=8-1.04×0.75,
=8-0.78,
=7.22;
(5)2.5×1.25×32,
=(2.5×4)×(1.25×8),
=10×10,
=100;
(6)25.7×3.29+6.71×25.7,
=25.7×(3.29+6.71),
=25.7×10,
=257.