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下面各题能算简便要简算,每题要写出主要的计算过程.(1)3.07×101-3.07(2)4.56+37+4.44+47(3)1.25×3.2×2.5(4)59−(56−712)(5)[(9+0.25)×12]÷30(6)1-[910-(3

题目详情
下面各题能算简便要简算,每题要写出主要的计算过程.
(1)3.07×101-3.07                (2)4.56+
3
7
+4.44+
4
7

(3)1.25×3.2×2.5                (4)
5
9
−(
5
6
7
12
)
(5)[(9+0.25)×12]÷30          (6)1-[
9
10
-(
3
4
-
1
6
)].
▼优质解答
答案和解析
(1)3.07×101-3.07 
=3.07×100+3.07-3.07,
=307;
(2)4.56+
3
7
+4.44+
4
7

=(4.56+4.44)+(
3
7
+
4
7
),
=9+1,
=10;
(3)1.25×3.2×2.5
=(1.25×0.8)×(2.5×4),
=1×10,
=10;
(4)
5
9
−(
5
6
7
12
)
=
5
9
1
4

=
11
36

(5)[(9+0.25)×12]÷30
=[9.25×12]÷30,
=111÷30
=3.7;
(6)1-[
9
10
-(
3
4
-
1
6
)]
=1-[
9
10
-
7
12
],
=1-
19
60

=
41
60