分析:(1)根據(jù)連續(xù)除以兩個數(shù)等于除以這兩個數(shù)的積簡算;
(2)先算除法,再算減法,最后算加法;
(3)同時運算除法和乘法,再算加法;
(4)先把16分解成2×8,然后使用乘法結合律簡算;
(5)運用乘法分配律簡算;
(6)先算小括號里面的除法,再運用乘法分配律簡算;
(7)先把35分解成7×5,然后根據(jù)除以兩個數(shù)的積,等于連續(xù)除以這兩個數(shù)簡算;
(8)先把和131+139運算結果相等的數(shù)結合在一起,然后再加上135,由此求解.
解答:解:(1)9000÷125÷8,
=9000÷(125×8),
=9000÷1000,
=9;
(2)1900-900÷75+25,
=1900-12+25,
=1888+25,
=1913;
(3)7200÷36+64×28,
=200+1792,
=1992;
(4)35×125×16,
=35×125×2×8,
=(35×2)×(125×8),
=70×1000,
=70000;
(5)78×63-78+38×78,
=78×(63-1+38),
=78×100,
=7800;
(6)(480+120÷15)×50,
=(480+8)×50,
=480×50+8×50,
=24000+400,
=24400;
(7)630÷35,
=630÷7÷5,
=90÷5,
=18;
(8)131+132+133+134+135+136+137+138+139,
=(131+139)+(321+138)+(133+137)+(134+136)+135,
(131+139)×4+135,
=270×4+135,
=1080+135,
=1215.
點評:考查了運算定律與簡便運算,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律簡便計算.