答案
解:(1)25.3+(-7.3)+(-13.7)+7.3
=(25.3+7.3)+[(-7.3)+(-13.7)]
=32.6+(-21)
=11.6;
(2)1-4
2÷5×(-
)
=1-16×
×(-
)
=1+
=
;
(3)(
-
-
)×(-60)
=
×(-60)-
×(-60)-
×(-60)
=-40+5+16
=-19;
(4)(-12)÷(-3)+4÷(-2
2)
=12÷3+4÷(-4)
=4-1
=3;
(5)
-14÷(-5)2×(-)+|0.8-1|=-1÷25×(-
)+1-0.8
=-1×
×(-
)+0.2
=
+
=
.
解:(1)25.3+(-7.3)+(-13.7)+7.3
=(25.3+7.3)+[(-7.3)+(-13.7)]
=32.6+(-21)
=11.6;
(2)1-4
2÷5×(-
)
=1-16×
×(-
)
=1+
=
;
(3)(
-
-
)×(-60)
=
×(-60)-
×(-60)-
×(-60)
=-40+5+16
=-19;
(4)(-12)÷(-3)+4÷(-2
2)
=12÷3+4÷(-4)
=4-1
=3;
(5)
-14÷(-5)2×(-)+|0.8-1|=-1÷25×(-
)+1-0.8
=-1×
×(-
)+0.2
=
+
=
.