问题
解答题
下面各题怎样简便就怎样算.
①4×0.8×2.5×12.5
②(2.8+3.85÷3.5)×4.6.
答案
①4×0.8×2.5×12.5,
=(4×2.5)×(0.8×12.5),
=10×10,
=100;
②(2.8+3.85÷3.5)×4.6,
=(2.8+1.1)×4.6,
=3.9×4.6,
=17.94.
下面各题怎样简便就怎样算.
①4×0.8×2.5×12.5
②(2.8+3.85÷3.5)×4.6.
①4×0.8×2.5×12.5,
=(4×2.5)×(0.8×12.5),
=10×10,
=100;
②(2.8+3.85÷3.5)×4.6,
=(2.8+1.1)×4.6,
=3.9×4.6,
=17.94.