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计算(写出主要计算过程,能用简便算法的用简便算法).(1)301×(372-6489);(2)1.44÷[1.2×(0.832+0.368)];(3)(234×0.72+725×2.75)×[4.375-(238+113)];(4)[13+833×(56-0.375)]÷23.
题目详情
计算(写出主要计算过程,能用简便算法的用简便算法).
(1)301×(372-6489);
(2)1.44÷[1.2×(0.832+0.368)];
(3)(2
×0.72+
×2.75)×[4.375-(2
+1
)];
(4)[
+
×(
-0.375)]÷
.
(1)301×(372-6489);
(2)1.44÷[1.2×(0.832+0.368)];
(3)(2
3 |
4 |
7 |
25 |
3 |
8 |
1 |
3 |
(4)[
1 |
3 |
8 |
33 |
5 |
6 |
2 |
3 |
▼优质解答
答案和解析
(1)301×(372-6489)
=(300+1)×(-6117)
=300×(-6117)+1×(-6117)
=-1835100-6117
=-1841217;
(2)1.44÷[1.2×(0.832+0.368)]
=1.44÷[1.2×1.2]
=1.44÷1.44
=1;
(3)(2
×0.72+
×2.75)×[4.375-(2
+1
)]
=(2.75×0.72+0.28×2.75)×[4.375-(2.375+1
)]
=[(0.72+0.28)×2.75]×[4.375-2.375-1
]
=[1×2.75]×
=2.75×
=
;
(4)[
+
×(
-0.375)]÷
=[
+
×
]÷
.
=[
+
]÷
.
=
÷
=
.
=(300+1)×(-6117)
=300×(-6117)+1×(-6117)
=-1835100-6117
=-1841217;
(2)1.44÷[1.2×(0.832+0.368)]
=1.44÷[1.2×1.2]
=1.44÷1.44
=1;
(3)(2
3 |
4 |
7 |
25 |
3 |
8 |
1 |
3 |
=(2.75×0.72+0.28×2.75)×[4.375-(2.375+1
1 |
3 |
=[(0.72+0.28)×2.75]×[4.375-2.375-1
1 |
3 |
=[1×2.75]×
2 |
3 |
=2.75×
2 |
3 |
=
11 |
6 |
(4)[
1 |
3 |
8 |
33 |
5 |
6 |
2 |
3 |
=[
1 |
3 |
8 |
33 |
11 |
24 |
2 |
3 |
=[
1 |
3 |
1 |
9 |
2 |
3 |
=
4 |
9 |
2 |
3 |
=
2 |
3 |
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