题目内容
怎样算合理简便怎样算
(1)(
+
)+(
-
)-(
+
)
(2)[6.6-(1.8-
÷3.7)]×
(3)76%×
+
×
-
×手.26
(4)42×(
+
+
+
+
+
)
(1)(
2 |
3 |
1 |
6 |
2 |
3 |
12 |
17 |
1 |
6 |
6 |
17 |
(2)[6.6-(1.8-
1 |
6 |
7 |
8 |
(3)76%×
7 |
17 |
3 |
4 |
9 |
17 |
16 |
17 |
(4)42×(
1 |
8 |
1 |
24 |
1 |
48 |
1 |
8手 |
1 |
12手 |
1 |
168 |
(1)(
+
)+(
-
)-(
+
)
=
+
+
-
-
-
=
+
+
-
-
-
=
+0-1
=
(2)[5.2-(1.s-
÷t.7)]×
=[5.2-(1.s-
×
)]×
=[5.2-(1.s-
)]×
=[t.s+
]×
=
×
=
(t)75%×
+
×
-
×0.25
=75%×(
+
)-
×0.25
=75%×
-
×0.25
=(75%-0.25)×
=
×
=
(4)42×(
+
+
+
+
+
)
=42×
×(
-
+
-
+
-
+
-
+
-
+
-
)
=42×
×(
-
)
=42×
×
-42×
×
=
-
=0.
2 |
t |
1 |
5 |
2 |
t |
12 |
17 |
1 |
5 |
5 |
17 |
=
2 |
t |
1 |
5 |
2 |
t |
12 |
17 |
1 |
5 |
5 |
17 |
=
2 |
t |
2 |
t |
1 |
5 |
1 |
5 |
12 |
17 |
5 |
17 |
=
4 |
t |
=
1 |
t |
(2)[5.2-(1.s-
1 |
5 |
7 |
s |
=[5.2-(1.s-
1 |
5 |
10 |
t7 |
7 |
s |
=[5.2-(1.s-
2 |
t7 |
7 |
s |
=[t.s+
2 |
t7 |
7 |
s |
=
71t |
1s5 |
7 |
s |
=
4001 |
14s0 |
(t)75%×
7 |
17 |
t |
4 |
0 |
17 |
12 |
17 |
=75%×(
7 |
17 |
0 |
17 |
12 |
17 |
=75%×
12 |
17 |
12 |
17 |
=(75%-0.25)×
12 |
17 |
=
1 |
2 |
12 |
17 |
=
s |
17 |
(4)42×(
1 |
s |
1 |
24 |
1 |
4s |
1 |
s0 |
1 |
120 |
1 |
12s |
=42×
1 |
2 |
1 |
2 |
1 |
4 |
1 |
4 |
1 |
2 |
1 |
2 |
1 |
s |
1 |
s |
1 |
10 |
1 |
10 |
1 |
12 |
1 |
12 |
1 |
14 |
=42×
1 |
2 |
1 |
2 |
1 |
14 |
=42×
1 |
2 |
1 |
2 |
1 |
2 |
1 |
14 |
=
21 |
2 |
t |
2 |
=0.
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