計(jì)算下列各題,能簡算的要簡算.
(124-85)×12÷26 2000÷125÷8 528-53-47
125×32×25 35×99+35 17×23-23×7.
解:(1)(124-85)×12÷26,
=39×12÷26,
=468÷26,
=18;
(2)2000÷125÷8,
=2000÷(125×8),
=2000÷1000,
=2;
(3)528-53-47,
=528-(53+47),
=528-100,
=428;
(4)125×32×25,
=125×(4×8)×25,
=(125×8)×(4×25),
=1000×100,
=100000;
(5)35×99+35,
=35×(99+1),
=35×100,
=3500;
(6)17×23-23×7,
=(17-7)×23,
=10×23,
=230.
分析:(1)先算減法,再算乘法,最后算除法;
(2)2000連續(xù)除以125與8,等于除以125與8的乘積;
(3)528連續(xù)減去53與47,等于減去53與47的和;
(4)把32拆成4×8,然后再根據(jù)乘法交換律和結(jié)合律進(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.
點(diǎn)評:四則混合運(yùn)算,先弄清運(yùn)算順序,然后再進(jìn)一步計(jì)算即可,能簡算的要簡算.