考點(diǎn):整數(shù)四則混合運(yùn)算,運(yùn)算定律與簡便運(yùn)算
專題:運(yùn)算順序及法則,運(yùn)算定律及簡算
分析:(1)先算除法和乘法,再算加法;
(2)根據(jù)乘法結(jié)合律進(jìn)行簡算;
(3)根據(jù)乘法分配律進(jìn)行簡算;
(4)根據(jù)乘法分配律進(jìn)行簡算;
(5)根據(jù)乘法分配律進(jìn)行簡算;
(6)根據(jù)乘法分配律進(jìn)行簡算.
解答:
解:(1)480÷3+30×2
=160+60
=220;
(2)250×44
=250×(4×11)
=(250×4)×11
=1000×11
=11000;
(3)28+99×28
=28×(1+99)
=28×100
=2800;
(4)78×99
=78×(100-1)
=78×100-78×1
=7800-78
=7722;
(5)201×50
=(200+1)×50
=200×50+1×50
=10000+50
=10050;
(6)314×75+25×314
=314×(75+25)
=314×100
=31400.
點(diǎn)評: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)算定律簡便計算.