问题
解答题
用简便方法计算:
0.125×0.25×8×4
7.4×0.28+0.28×2.6
15.89-3.2-6.8.
答案
0.125×0.25×8×4,
=(0.125×8)×(0.25×4),
=1×1,
=1;
7.4×0.28+0.28×2.6,
=(7.4+2.6)×0.28,
=10×0.28,
=2.8;
15.89-3.2-6.8,
=15.89-(3.2+6.8),
=15.89-10,
=5.89.