脱式计算能用简便计算的要简算.(1)310+4.25+3.7+134(2)0.125×3.2×25(3)17×44+54×17(4)7.8÷
脱式计算能用简便计算的要简算.(1)310+4.25+3.7+134(2)0.125×3.2×25(3)17×44+54×17(4)7.8÷〔32×(1-58)+3.6〕...
脱式计算能用简便计算的要简算.(1)310+4.25+3.7+134(2)0.125×3.2×25(3)17×44+54×17(4)7.8÷〔32×(1-58)+3.6〕(5)56÷〔34×(79-13)〕
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劫八吼4261
2014-08-29
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(1)
+4.25+3.7+1
=
+3.7+4.25+1
=(
+3.7)+(4.25+1
)
=4+6
=10;
(2)0.125×3.2×25
=0.125×8×0.4×25
=(0.125×8)×(0.4×25)
=1×10
=10;
(3)
×44+54×
=
×(44+54)
=
×98
=14;
(4)7.8÷〔32×(1-
)+3.6〕
=7.8÷〔32×
+3.6〕
=7.8÷〔12+3.6〕
=7.8÷15.6
=0.5;
(5)
÷〔
×(
-
)〕
=
÷〔
×
〕
=
÷
=2.5.
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