计算题0.258×447+258×0.678-25.8×1.25 4.52×1.5+4.48÷
-1.5
7.09×
+0.225×6-60%×0.64 (
+
)+(
+
)
×
-
×0.75+0.8×
+
×![](http://math.21cnjy.com/mml2svg?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmfrac%3E%3Cmrow%3E%3Cmn%3E5%3C%2Fmn%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmn%3E6%3C%2Fmn%3E%3C%2Fmrow%3E%3C%2Fmfrac%3E%3C%2Fmath%3E)
÷[
-4.5×(20%+
)] 7+14+21+28+…+777+784
[(77+
)×(1-
)-1.5]÷0.2
×3+
×25+
×![](http://math.21cnjy.com/mml2svg?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmfrac%3E%3Cmrow%3E%3Cmn%3E3%3C%2Fmn%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmn%3E1%3C%2Fmn%3E%3Cmn%3E3%3C%2Fmn%3E%3C%2Fmrow%3E%3C%2Fmfrac%3E%3C%2Fmath%3E)
6.37×1.25-
+4.63×125%
×[0.75-(
-25%)]÷1.25
×
+
×
+
×
+
×
(2-1÷2)×(2-2÷3)×(2-3÷4)×……(2-2002÷2003)
1+
+
+……+
-
+
-
+
-![](http://math.21cnjy.com/mml2svg?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmfrac%3E%3Cmrow%3E%3Cmn%3E1%3C%2Fmn%3E%3Cmn%3E0%3C%2Fmn%3E%3Cmn%3E5%3C%2Fmn%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmn%3E1%3C%2Fmn%3E%3Cmn%3E6%3C%2Fmn%3E%3Cmn%3E8%3C%2Fmn%3E%3C%2Fmrow%3E%3C%2Fmfrac%3E%3C%2Fmath%3E)
×
+
×
+
×
+
×
(
+
+
)×(12×
-2×
+4×
)
+
+
+……+
+
[1-(1-0.5×
)]×12+27÷214×49×12÷
×
×12