递等式计算.(能简便运算的要用简便方法计算) 14760÷36-24×11 5.2×4.5+4.5×3.8+4.5 12.5×25×0.4×0.8 5-(
4.8÷16+〔1÷(5
[4.2+(5.36-1.2)÷0.26]÷20. |
(1)14760÷36-24×11,
=410-264,
=146;
(2)5.2×4.5+4.5×3.8+4.5,
=4.5×(5.2+3.8+1),
=4.5×10,
=45;
(3)12.5×25×0.4×0.8,
=(12.5×0.8)×(25×0.4),
=10×10,
=100;
(4)5-(
÷6 7
+3 14
),6 13
=5-(4+
),6 13
=5-4-
,6 13
=1-
,6 13
=
;7 13
(5)4.8÷16+[1÷(5
-5.09)],1 10
=4.8÷16+[1÷0.01],
=4.8÷16+100,
=0.3+100,
=100.3;
(6)[4.2+(5.36-1.2)÷0.26]÷20,
=[4.2+4.26÷0.26]÷20,
=[4.2+16]÷20,
=20.4÷20,
=1.02.