解:(1)(2-0.6)÷
,
=1.4÷
,
=1.4×
,
=3;
(2)560÷16÷5,
=560÷(16×5),
=560÷80,
=7;
(3)3.8×99+3.8,
=3.8×(99+1),
=3.8×100,
=380;
(4)3.1-
-1.1-
,
=(3.1-1.1)-(
+
),
=2-1,
=1;
(5)(3.8-1.8÷2)×50%,
=(3.8-0.9)×50%,
=2.9×0.5,
=1.45;
(6)
,
=
÷[3-(
)],
=
÷[3-1],
=
÷2,
=
.
分析:(1)先算括號里面的減法,再算除法;
(2)根據(jù)連續(xù)減去兩個數(shù)等于減去這兩個數(shù)的和來簡算;
(3)運(yùn)用乘法分配律簡算;
(4)運(yùn)用加法結(jié)合律以及連續(xù)減去兩個數(shù)等于減去這兩個數(shù)的和來簡算;
(5)先算括號里面的除法,再算括號里面的減法,最后算括號外的乘法;
(6)根據(jù)連續(xù)減去兩個數(shù)等于減去這兩個數(shù)的和來簡算.
點(diǎn)評:這類型的題目先觀察算式,看能不能運(yùn)用簡便運(yùn)算的方法簡算,若不能就要按照運(yùn)算順序逐步運(yùn)算.