考點:整數(shù)四則混合運算,運算定律與簡便運算
專題:運算順序及法則
分析:(1)先把32分解成8×4,再根據(jù)乘法交換律、結合律簡算;
(2)先算除法,再利用乘法結合律簡算;
(3)根據(jù)乘法交換律簡算,再根據(jù)乘法分配律簡算;
(4)先算小括號里面的乘法,再根據(jù)加法交換律簡算;
(5)按照從左到右的順序計算;
(6)根據(jù)乘法分配律簡算.
解答:
解:(1)125×30×32
=125×30×(8×4)
=(125×8)×(30×4)
=1000×120
=120000;
(2)12000÷125×25
=96×25
=(24×4)×25
=24×(4×25)
=24×100
=2400;
(3)6363×506÷63
=6363÷63×506
=101×506
=(100+1)×506
=100×506+1×506
=50600+506
=51106;
(4)1568+(25×24-168)
=1568+(600-168)
=1568-168+600
=1400+600
=2000;
(5)125×8÷125×8
=1000÷125×8
=8×8
=64;
(6)64×46+46+35×46
=46×(64+1+35)
=46×100
=4600.
點評:本題考查了四則混合運算,注意運算順序和運算法則,靈活運用所學的運算定律進行簡便計算.