简算 299÷(299+299/300) 4×0.8×2.5×12.5 8418/19×0.375+1051/19×3/8.

问题描述:

简算
299÷(299+

299
300
)            
 4×0.8×2.5×12.5
84
18
19
×0.375+105
1
19
×
3
8

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.