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脱式计算.(能简算的要简算,并写出主要的简便过程)(1)3.58-2.36-(2.64-1.42)(2)(14+16−13)×12(3)3.6×118+8.4÷811(4)34÷[3.75×(1.2−15)].

题目详情
脱式计算.(能简算的要简算,并写出主要的简便过程)
(1)3.58-2.36-(2.64-1.42)
(2)(
1
4
+
1
6
1
3
)×12
(3)3.6×
11
8
+8.4÷
8
11

(4)
3
4
÷[3.75×(1.2−
1
5
)].
▼优质解答
答案和解析
(1)3.58-2.36-(2.64-1.42)
=3.58-2.36-2.64+1.42
=(3.58+1.42)-(2.36+2.64)
=5-5
=0;

(2)(
1
4
+
1
6
1
3
)×12
=
1
4
×12+
1
6
×12-
1
3
×12
=3+2-4
=1;

(3)3.6×
11
8
+8.4÷
8
11

=3.6×
11
8
+8.4×
11
8

=(3.6+8.4)×
11
8

=12×
11
8

=
33
2


(4)
3
4
÷[3.75×(1.2−
1
5
)]
=
3
4
÷[3.75×1]
=
3
4
÷3
3
4

=
1
5