问题
解答题
计算. (1)
(2)3.68×[1÷(2.1-2.09)] (3)7.8÷[32×(1-
|
答案
(1)
-(7 8
+1 2
)×3 5
,5 11
=
-7 8
×11 10
,5 11
=
-7 8
,1 2
=
;3 8
(2)3.68×[1÷(2.1-2.09)],
=3.68×[1÷0.01],
=3.68×100,
=368;
(3)7.8÷[32×(1-
)+3.6],5 8
=7.8÷[32×
+3.6],3 8
=7.8÷[12+3.6],
=7.8÷15.6,
=0.5.