问题 解答题
简算
299÷(299+
299
300
)            
 4×0.8×2.5×12.5
84
18
19
×0.375+105
1
19
×
3
8
答案

299÷(299+

299
300
),

=(299×

1
299
)÷[(299+
299
300
)×
1
299
],

=1÷[1+

1
300
],

=1÷

301
300

=

300
301

4×0.8×2.5×12.5,

=(4×2.5)×(0.8×12.5),

=10×10,

=100;

84

18
19
×0.375+105
1
19
×
3
8

=84

18
19
×
3
8
+105
1
19
×
3
8

=(84

18
19
+105
1
19
)×
3
8

=190×

3
8

=71.25.

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