用简便方法计算(1)(-3.7)×(-0.125)×(-8)(2)(13-16-112)×(-12)(3)-17×(-31617)
用简便方法计算(1)(-3.7)×(-0.125)×(-8)(2)(13-16-112)×(-12)(3)-17×(-31617)(4)-5×(-115)+13×(-11...
用简便方法计算(1)(-3.7)×(-0.125)×(-8)(2)(13-16-112)×(-12)(3)-17×(-31617) (4)-5×(-115)+13×(-115)-3×(-115)
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(1)(-3.7)×(-0.125)×(-8),
=(-3.7)×1,
=-3.7;
(2)(
-
-
)×(-12),
=
×(-12)-
×(-12)-
×(-12),
=-4+2+1,
=-1;
(3)-17×(-3
),
=-17×(-4+
),
=-17×(-4)+(-17)×
,
=68-1,
=67;
(4)-5×(-
)+13×(-
)-3×(-
),
=(-
)×(-5+13-3),
=(-
)×5,
=-11.
=(-3.7)×1,
=-3.7;
(2)(
1 |
3 |
1 |
6 |
1 |
12 |
=
1 |
3 |
1 |
6 |
1 |
12 |
=-4+2+1,
=-1;
(3)-17×(-3
16 |
17 |
=-17×(-4+
1 |
17 |
=-17×(-4)+(-17)×
1 |
17 |
=68-1,
=67;
(4)-5×(-
11 |
5 |
11 |
5 |
11 |
5 |
=(-
11 |
5 |
=(-
11 |
5 |
=-11.
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