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用你喜欢的方法计算,并写出主要的计算过程(1)6.1+(2.9-0.7)-4.3(2)125.125×8(3)(16+27)÷142(4)125×37×8×715(5)(78-316)×(1-19)(6)(35-63×49)÷711.

题目详情
用你喜欢的方法计算,并写出主要的计算过程
(1)6.1+(2.9-0.7)-4.3 (2)125.125×8 (3)(
1
6
+
2
7
)÷
1
42
(4)125×
3
7
×8×
7
15
(5)(
7
8
-
3
16
)×(1-
1
9
(6)(35-63×
4
9
)÷
7
11
▼优质解答
答案和解析
(1)6.1+(2.9-0.7)-4.3,
=6.1+2.2-4.3,
=4;

(2)125.125×8,
=(125+0.125)×8,
=125×8+0.125×8,
=1000+1,
=1001;

(3)((
1
6
+
2
7
)÷
1
42

=(
1
6
+
2
7
)×42,
=
1
6
×42+
2
7
×42,
=7+12,
=19;


(4)125×
3
7
×8×
7
15

=(125×8)×(
3
7
×
7
15
),
=1000×
1
5

=200,;

(5)(
7
8
-
3
16
)×(1-
1
9
),
=
11
16
×
8
9

=
11
18


(6)(35-63×
4
9
)÷
7
11

=(35-28)÷
7
11

=7×
11
7

=11.