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
×0.375+10518 19
×1 19
. 3 8
答
299÷(299+
),299 300
=(299×
)÷[(299+1 299
)×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
×0.375+10518 19
×1 19
,3 8
=84
×18 19
+1053 8
×1 19
,3 8
=(84
+10518 19
)×1 19
,3 8
=190×
,3 8
=71.25.