题目内容

计算题
(1)8+(-
1
4
)-(-0.25)

(2)(-4
1
2
)÷(-10)×(3
1
3
)÷(-2
1
2
)

(3)99.9×(-3)(用简便方法计算)
(4)4-(-2)3-32÷(-1)
(1)8+(-
1
4
)-(-0.25)

=8+0
=8;

(2)(-4
1
2
)÷(-10)×(3
1
3
)÷(-2
1
2
)

=-
9
2
×
1
10
×
10
3
×
2
5

=-
3
5


(3)99.9×(-3)
=(100-0.1)×(-3)
=100×(-3)-0.1×(-3)
=-300+0.3
=-299.7;

(4)4-(-2)3-32÷(-1)
=4+8+9÷1
=4+8+9
=21.
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