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①(+114)×(-2.4)×(-0.125);②0.1×(-100)×(-0.001)×(-10)×(-1000)×(-0.01);③(+2831)×(-127)×(+2115)×(-412);④(-375)×(-8)+(-375)×(-9)+375×(-7).

题目详情
①(+1
1
4
)×(-2.4)×(-0.125);       
②0.1×(-100)×(-0.001)×(-10)×(-1000)×(-0.01);
③(+2
8
31
)×(-1
2
7
)×(+2
1
15
)×(-4
1
2
);
④(-375)×(-8)+(-375)×(-9)+375×(-7).
▼优质解答
答案和解析
①(+1
1
4
)×(-2.4)×(-0.125)
=
5
4
×
12
5
×
1
8

=
3
8
;       
②0.1×(-100)×(-0.001)×(-10)×(-1000)×(-0.01)
=[0.1×(-10)]×[(-0.001)×(-1000)]×[(-100)×(-0.01)]
=-1×1×1
=-1;
③(+2
8
31
)×(-1
2
7
)×(+2
1
15
)×(-4
1
2

=
70
31
×(-
9
7
)×(+
31
15
)×(-
9
2

=27;
④(-375)×(-8)+(-375)×(-9)+375×(-7)
=(-375)×(-8-9+7)
=(-375)×(-10)
=3750.