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脱式计算.(能简算的要简算)78×9.9+7.825×32×1.25(0.18+910)÷912×[(116-23)×3]213÷1839÷627359+4.7+49+0.3.
题目详情
脱式计算.(能简算的要简算)
78×9.9+7.8 | 25×32×1.25 | (0.18+
| ||||||||||||||
12×[(
|
| 3
|
▼优质解答
答案和解析
(1)78×9.9+7.8
=7.8×99+7.8×1
=7.8×(99+1)
=7.8×100
=780
(2)25×32×1.25
=25×4×8×1.25
=(25×4)×(8×1.25)
=100×10
=1000
(3)(0.18+
)÷9
=(0.18+
)×
=0.18×
+
×
=0.02+0.1
=0.12
(4)12×[(
-
)×3]
=12×[
×3-
×3]
=12×[
-2]
=12×
-12×2
=66-24
=42
(5)
÷
÷
=
×
×
=
×
=
(6)3
+4.7+
+0.3
=(3
+
)+(4.7+0.3)
=4+5
=9
=7.8×99+7.8×1
=7.8×(99+1)
=7.8×100
=780
(2)25×32×1.25
=25×4×8×1.25
=(25×4)×(8×1.25)
=100×10
=1000
(3)(0.18+
9 |
10 |
=(0.18+
9 |
10 |
1 |
9 |
=0.18×
1 |
9 |
9 |
10 |
1 |
9 |
=0.02+0.1
=0.12
(4)12×[(
11 |
6 |
2 |
3 |
=12×[
11 |
6 |
2 |
3 |
=12×[
11 |
2 |
=12×
11 |
2 |
=66-24
=42
(5)
2 |
13 |
18 |
39 |
6 |
27 |
=
2 |
13 |
39 |
18 |
27 |
6 |
=
1 |
3 |
27 |
6 |
=
3 |
2 |
(6)3
5 |
9 |
4 |
9 |
=(3
5 |
9 |
4 |
9 |
=4+5
=9
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