解题思路:(1)运用加法交换律与结合律简算;
(2)(4)运用乘法分配律简算;
(3)先算括号内的除法,再算括号内的减法,最后算括号外的除法;
(5)把原式变为1000÷(4×8)÷[1/4]÷[1/8],在把除法变为乘法,计算即可;
(6)把分数变为小数,运用加法交换律与结合律简算.
(1)[4/7]+3.52+[3/7]+48%,
=([4/7]+[3/7])+(3.52+48%),
=1+4,
=5;
(2)[3/4]×[1/11]+[1/11×
1
4],
=([3/4]+[1/4])×[1/11],
=1×[1/11],
=[1/11];
(3)[5/7]÷(5-3.9×[2/3]),
=[5/7]÷(5-2.6),
=[5/7]÷2.4,
=[5/7]÷[12/5],
=[5/7]×[5/12],
=[25/84];
(4)25-25×[99/100],
=25×(1-[99/100]),
=25×[1/100],
=[1/4];
(5)1000÷32÷0.25÷0.125,
=1000÷(4×8)÷[1/4]÷[1/8],
=1000÷4÷8×4×8,
=1000×(4÷4)×(8÷8),
=1000;
(6)38[3/4]-15.38+61.25-4.62,
=38.75-15.38+61.25-4.62,
=(38.75+61.25)-(15.38+4.62),
=100-20,
=80.
点评:
本题考点: 整数、分数、小数、百分数四则混合运算;运算定律与简便运算.
考点点评: 此题考查了四则混合运算,注意运算顺序和运算法则,灵活运用所学的运算律简便计算.