Question

簡算：
0.28×202                          
3.12×2.4+1.88×2.4
0.125×16                              
2.33×0.5×4．

Answer 1

考點(diǎn)：運(yùn)算定律與簡便運(yùn)算

專題：運(yùn)算定律及簡算

分析：①把202寫成200+2，再根據(jù)乘法分配律進(jìn)行計(jì)算；
②根據(jù)乘法分配律進(jìn)行計(jì)算；
③把16寫成8×2，再根據(jù)乘法結(jié)合律計(jì)算；
④再根據(jù)乘法結(jié)合律計(jì)算．

解答： 解：①0.28×202 
=0.28×（200+2）
=0.28×200+0.28×2
=56+0.56
=56.56
                         
②3.12×2.4+1.88×2.4
=2.4×（3.12+1.88）
=2.4×5
=12

③0.125×16 
=0.125×8×2
=1×2
=2
                             
④2.33×0.5×4
=2.33×（0.5×4）
=2.33×2
=4.66

點(diǎn)評(píng)：考查了運(yùn)算定律與簡便運(yùn)算，四則混合運(yùn)算．注意運(yùn)算順序和運(yùn)算法則，靈活運(yùn)用所學(xué)的運(yùn)算定律簡便計(jì)算．