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计算:(要求写出计算过程)(1)137×(13113−1911)×0.7×2835(2)114×3.9×2.1÷(312×212×39100)(3)(3.875×25.7+378×7415+618×99.9)÷12(4)1013÷2622−125×1113÷7.
题目详情
计算:(要求写出计算过程)
(1)1
×(13
−1
)×0.7×28
(2)1
×3.9×2.1÷(3
×2
×
)
(3)(3.875×25.7+3
×74
+6
×99.9)÷
(4)
÷2
−1
×
÷7.
(1)1
3 |
7 |
1 |
13 |
9 |
11 |
3 |
5 |
(2)1
1 |
4 |
1 |
2 |
1 |
2 |
39 |
100 |
(3)(3.875×25.7+3
7 |
8 |
1 |
5 |
1 |
8 |
1 |
2 |
(4)
10 |
13 |
6 |
22 |
2 |
5 |
11 |
13 |
▼优质解答
答案和解析
(1)1
×(13
−1
)×0.7×28
,
=
×(
-
)×
×
,
=(
×
)×(
-
)×
,
=(
-
)×
,
=
×
-
×
,
=374-52,
=322;
(2)1
×3.9×2.1÷(3
×2
×
),
=1.25×3.9×2.1÷(3.5×2.5×0.39),
=1.25×3.9×2.1÷3.5÷2.5÷0.39,
=(1.25÷2.5)×(3.9÷0.39)×(2.1÷3.5),
=0.5×10×0.6,
=5×0.6,
=3;
(3)(3.875×25.7+3
×74
+6
×99.9)÷
,
=(3.875×25.7+3.875×74.2+6.125×99.9)×2,
=[3.875×(25.7+74.2)+6.125×99.9]×2,
=[3.875×99.9+6.125×99.9]×2,
=(3.875+6.125)×99.9×2,
=10×99.9×2,
=999×2,
=1998;
(4)
÷2
−1
×
÷7,
=
(1)1
3 |
7 |
1 |
13 |
9 |
11 |
3 |
5 |
=
10 |
7 |
168 |
13 |
20 |
11 |
7 |
10 |
143 |
5 |
=(
10 |
7 |
7 |
10 |
168 |
13 |
20 |
11 |
143 |
5 |
=(
170 |
13 |
20 |
11 |
143 |
5 |
=
170 |
13 |
143 |
5 |
20 |
11 |
143 |
5 |
=374-52,
=322;
(2)1
1 |
4 |
1 |
2 |
1 |
2 |
39 |
100 |
=1.25×3.9×2.1÷(3.5×2.5×0.39),
=1.25×3.9×2.1÷3.5÷2.5÷0.39,
=(1.25÷2.5)×(3.9÷0.39)×(2.1÷3.5),
=0.5×10×0.6,
=5×0.6,
=3;
(3)(3.875×25.7+3
7 |
8 |
1 |
5 |
1 |
8 |
1 |
2 |
=(3.875×25.7+3.875×74.2+6.125×99.9)×2,
=[3.875×(25.7+74.2)+6.125×99.9]×2,
=[3.875×99.9+6.125×99.9]×2,
=(3.875+6.125)×99.9×2,
=10×99.9×2,
=999×2,
=1998;
(4)
10 |
13 |
6 |
22 |
2 |
5 |
11 |
13 |
=
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