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计算(1)(-513)×(+178)×(-215);(2)36×(23−59+712);(3)用简便方法计算25×(12)2-(-25)×(15)+25×34;
题目详情
计算(1)(-5
)×(+1
)×(-2
);
(2)36×(
−
+
);
(3)用简便方法计算25×(
)2-(-25)×(
)+25×
;
)×(+1
)×(-2
);
(2)36×(
−
+
);
(3)用简便方法计算25×(
)2-(-25)×(
)+25×
;
1 1 3 3
)×(-2
);
(2)36×(
−
+
);
(3)用简便方法计算25×(
)2-(-25)×(
)+25×
;
7 7 8 8
);
(2)36×(
−
+
);
(3)用简便方法计算25×(
)2-(-25)×(
)+25×
;
1 1 5 5
−
+
);
(3)用简便方法计算25×(
)2-(-25)×(
)+25×
;
2 2 3 3
5 5 9 9
7 7 12 12
)2-(-25)×(
)+25×
;
1 1 2 2 2
)+25×
;
1 1 5 5
;
3 3 4 4
1 |
3 |
7 |
8 |
1 |
5 |
(2)36×(
2 |
3 |
5 |
9 |
7 |
12 |
(3)用简便方法计算25×(
1 |
2 |
1 |
5 |
3 |
4 |
1 |
3 |
7 |
8 |
1 |
5 |
(2)36×(
2 |
3 |
5 |
9 |
7 |
12 |
(3)用简便方法计算25×(
1 |
2 |
1 |
5 |
3 |
4 |
1 |
3 |
7 |
8 |
1 |
5 |
(2)36×(
2 |
3 |
5 |
9 |
7 |
12 |
(3)用简便方法计算25×(
1 |
2 |
1 |
5 |
3 |
4 |
7 |
8 |
1 |
5 |
(2)36×(
2 |
3 |
5 |
9 |
7 |
12 |
(3)用简便方法计算25×(
1 |
2 |
1 |
5 |
3 |
4 |
1 |
5 |
2 |
3 |
5 |
9 |
7 |
12 |
(3)用简便方法计算25×(
1 |
2 |
1 |
5 |
3 |
4 |
2 |
3 |
5 |
9 |
7 |
12 |
1 |
2 |
1 |
5 |
3 |
4 |
1 |
2 |
1 |
5 |
3 |
4 |
1 |
5 |
3 |
4 |
3 |
4 |
▼优质解答
答案和解析
(1)(-5
)×(+1
)×(-2
)
=
×
×
=22;
(2)36×(
−
+
)
=36×
-36×
+36×
=24-20+21
=25;
(3)原式=25×
+25×
+25×
=25×(
+
+
)
=30.
1 1 13 3 3)×(+1
)×(-2
)
=
×
×
=22;
(2)36×(
−
+
)
=36×
-36×
+36×
=24-20+21
=25;
(3)原式=25×
+25×
+25×
=25×(
+
+
)
=30.
7 7 78 8 8)×(-2
)
=
×
×
=22;
(2)36×(
−
+
)
=36×
-36×
+36×
=24-20+21
=25;
(3)原式=25×
+25×
+25×
=25×(
+
+
)
=30.
1 1 15 5 5)
=
×
×
=22;
(2)36×(
−
+
)
=36×
-36×
+36×
=24-20+21
=25;
(3)原式=25×
+25×
+25×
=25×(
+
+
)
=30.
16 16 163 3 3×
15 15 158 8 8×
11 11 115 5 5
=22;
(2)36×(
−
+
)
=36×
-36×
+36×
=24-20+21
=25;
(3)原式=25×
+25×
+25×
=25×(
+
+
)
=30.
2 2 23 3 3−
5 5 59 9 9+
7 7 712 12 12)
=36×
-36×
+36×
=24-20+21
=25;
(3)原式=25×
+25×
+25×
=25×(
+
+
)
=30.
2 2 23 3 3-36×
+36×
=24-20+21
=25;
(3)原式=25×
+25×
+25×
=25×(
+
+
)
=30.
5 5 59 9 9+36×
=24-20+21
=25;
(3)原式=25×
+25×
+25×
=25×(
+
+
)
=30.
7 7 712 12 12
=24-20+21
=25;
(3)原式=25×
+25×
+25×
=25×(
+
+
)
=30.
1 1 14 4 4+25×
+25×
=25×(
+
+
)
=30.
1 1 15 5 5+25×
=25×(
+
+
)
=30.
3 3 34 4 4
=25×(
+
+
)
=30.
1 1 14 4 4+
+
)
=30.
1 1 15 5 5+
)
=30.
3 3 34 4 4)
=30.
1 |
3 |
7 |
8 |
1 |
5 |
=
16 |
3 |
15 |
8 |
11 |
5 |
=22;
(2)36×(
2 |
3 |
5 |
9 |
7 |
12 |
=36×
2 |
3 |
5 |
9 |
7 |
12 |
=24-20+21
=25;
(3)原式=25×
1 |
4 |
1 |
5 |
3 |
4 |
=25×(
1 |
4 |
1 |
5 |
3 |
4 |
=30.
1 |
3 |
7 |
8 |
1 |
5 |
=
16 |
3 |
15 |
8 |
11 |
5 |
=22;
(2)36×(
2 |
3 |
5 |
9 |
7 |
12 |
=36×
2 |
3 |
5 |
9 |
7 |
12 |
=24-20+21
=25;
(3)原式=25×
1 |
4 |
1 |
5 |
3 |
4 |
=25×(
1 |
4 |
1 |
5 |
3 |
4 |
=30.
7 |
8 |
1 |
5 |
=
16 |
3 |
15 |
8 |
11 |
5 |
=22;
(2)36×(
2 |
3 |
5 |
9 |
7 |
12 |
=36×
2 |
3 |
5 |
9 |
7 |
12 |
=24-20+21
=25;
(3)原式=25×
1 |
4 |
1 |
5 |
3 |
4 |
=25×(
1 |
4 |
1 |
5 |
3 |
4 |
=30.
1 |
5 |
=
16 |
3 |
15 |
8 |
11 |
5 |
=22;
(2)36×(
2 |
3 |
5 |
9 |
7 |
12 |
=36×
2 |
3 |
5 |
9 |
7 |
12 |
=24-20+21
=25;
(3)原式=25×
1 |
4 |
1 |
5 |
3 |
4 |
=25×(
1 |
4 |
1 |
5 |
3 |
4 |
=30.
16 |
3 |
15 |
8 |
11 |
5 |
=22;
(2)36×(
2 |
3 |
5 |
9 |
7 |
12 |
=36×
2 |
3 |
5 |
9 |
7 |
12 |
=24-20+21
=25;
(3)原式=25×
1 |
4 |
1 |
5 |
3 |
4 |
=25×(
1 |
4 |
1 |
5 |
3 |
4 |
=30.
2 |
3 |
5 |
9 |
7 |
12 |
=36×
2 |
3 |
5 |
9 |
7 |
12 |
=24-20+21
=25;
(3)原式=25×
1 |
4 |
1 |
5 |
3 |
4 |
=25×(
1 |
4 |
1 |
5 |
3 |
4 |
=30.
2 |
3 |
5 |
9 |
7 |
12 |
=24-20+21
=25;
(3)原式=25×
1 |
4 |
1 |
5 |
3 |
4 |
=25×(
1 |
4 |
1 |
5 |
3 |
4 |
=30.
5 |
9 |
7 |
12 |
=24-20+21
=25;
(3)原式=25×
1 |
4 |
1 |
5 |
3 |
4 |
=25×(
1 |
4 |
1 |
5 |
3 |
4 |
=30.
7 |
12 |
=24-20+21
=25;
(3)原式=25×
1 |
4 |
1 |
5 |
3 |
4 |
=25×(
1 |
4 |
1 |
5 |
3 |
4 |
=30.
1 |
4 |
1 |
5 |
3 |
4 |
=25×(
1 |
4 |
1 |
5 |
3 |
4 |
=30.
1 |
5 |
3 |
4 |
=25×(
1 |
4 |
1 |
5 |
3 |
4 |
=30.
3 |
4 |
=25×(
1 |
4 |
1 |
5 |
3 |
4 |
=30.
1 |
4 |
1 |
5 |
3 |
4 |
=30.
1 |
5 |
3 |
4 |
=30.
3 |
4 |
=30.
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