问题
解答题
计算,能简算的用简便方法计算. 125×8.08 86×15-380 79×25+20×79+79×55
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答案
125×8.08,
=125×8+125×0.08,
=1000+10,
=1010,
86×15-380,
=1290-380,
=910,
79×25+20×79+79×55,
=79×(25+20+55),
=79×100,
=7900,
×(3 7
-4 5
)2 3
=
×(3 7
-12 15
),10 15
=
×3 7
,2 15
=
,2 35
×7 13
÷8 5
,14 39
=
×7 13
×8 5
,39 14
=
,12 5
[
-(3 5
-3 4
)]÷4,2 5
=[
+3 5
-2 5
]÷4.3 4
=
×1 4
,1 4
=
.1 16