计算:(1)(-13+56-712)×225;(2)(-56)×(47-38+114);(3)-2×(-8)×5×(-114);(4)99
计算:(1)(-13+56-712)×225;(2)(-56)×(47-38+114);(3)-2×(-8)×5×(-114);(4)991718×(-18);(5)(-...
计算:(1)(-13+56-712)×225;(2)(-56)×(47-38+114);(3)-2×(-8)×5×(-114);(4)991718×(-18);(5)(-0.25)×13×(-34)×23;(6)3.1416×6.495+3.1416×(-5.495).
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(1)(-
+
-
)×2
,
=(-
+
-
)×
,
=-
×
+
×
-
×
,
=-
+2-
,
=2-
,
=-
;
(2)(-56)×(
-
+
),
=
×(-56)-
×(-56)+
×(-56),
=-32+21-4,
=-36+21,
=-15;
(3)-2×(-8)×5×(-1
),
=-2×5×(-8)×(-
),
=-10×10,
=-100;
(4)99
×(-18),
=(100-
)×(-18),
=100×(-18)-
×(-18),
=-1800+1,
=-1799;
(5)(-0.25)×13×(-
)×
,
=(-
)×13×(-
)×
,
=
×13×
×
,
=
;
(6)3.1416×6.495+3.1416×(-5.495),
=3.1416×(6.495-5.495),
=3.1416.
1 |
3 |
5 |
6 |
7 |
12 |
2 |
5 |
=(-
1 |
3 |
5 |
6 |
7 |
12 |
12 |
5 |
=-
1 |
3 |
12 |
5 |
5 |
6 |
12 |
5 |
7 |
12 |
12 |
5 |
=-
4 |
5 |
7 |
5 |
=2-
11 |
5 |
=-
1 |
5 |
(2)(-56)×(
4 |
7 |
3 |
8 |
1 |
14 |
=
4 |
7 |
3 |
8 |
1 |
14 |
=-32+21-4,
=-36+21,
=-15;
(3)-2×(-8)×5×(-1
1 |
4 |
=-2×5×(-8)×(-
5 |
4 |
=-10×10,
=-100;
(4)99
17 |
18 |
=(100-
1 |
18 |
=100×(-18)-
1 |
18 |
=-1800+1,
=-1799;
(5)(-0.25)×13×(-
3 |
4 |
2 |
3 |
=(-
1 |
4 |
3 |
4 |
2 |
3 |
=
1 |
4 |
3 |
4 |
2 |
3 |
=
13 |
8 |
(6)3.1416×6.495+3.1416×(-5.495),
=3.1416×(6.495-5.495),
=3.1416.
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