[2.25+(3
-1.21×
)]÷40%
1
+2
+3
+4
+…+10
(5.4×
1+6
÷0.75)×125.5
(1+
+
+
)×(
+
+
+
)-( 1+
+
+
+
)×(
+
+
)
(1)[2.25+(3
-1.21×
)]÷40%,
=[2.25+(3.6-0.55)]÷0.4,
=[2.25+3.05]÷0.4,
=5.3÷0.4,
=13.25;
(2)1
+2
+3
+4
+…+10
,
=(1+
)+(2+
)+(3+
)+(4+
)+…+(10+
),
=(1+2+3+4+…+10)+(
+
+
+
+…+
)
=(1+10)×10÷2+(
+
+
+
+…+
),
=11×10÷2+(1-
+
-
+
-
+
-
+…+
-
),
=55+(1-
),
=55+
,
=55
;
(3)(5.4×
1+6
÷0.75)×125.5
=(5.4×
+6.6÷0.75)×125.5
=(7.2+8.8)×125.5,
=16×125.5,
=2008;
(4)(1+
+
+
)×(
+
+
+
)-(1+
+
+
+
)×(
+
+
),
=(1+
+
+
)×(
+
+
+
)-[1×(
+
+
)+(
+
+
+
)×(
+
+
)],
=(1+
+
+
)×(
+
+
+
)-(
+
+
)-(
+
+
+
)×(
+
+
),
=(
+
+
+
)×[(1+
+
+
)-(
+
+
)]-(
+
+
),
=(
+
+
+
)-(
+
+
),
=
.
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