計(jì)算
(1)[5-3
÷(1
+2.25×
)]÷12.5%
(2)[2-(8.25-5
)×
]÷0.9
(3)(20
+12.56-31
)÷299+(13
-12.25)×1
(4)
×(4.85÷
-3.6+6.15×3
)+1.75×(1
+
)+5.5.
(1)[5-3
÷(1
+2.25×
)]÷12.5%,
=[5-3
÷(1
+
)]÷12.5%,
=[5-3
÷
]÷12.5%,
=[5-
]÷12.5%,
=
×8,
=
;
(2)[2-(8.25-5
)×
]÷0.9,
=[2-1.68×1.57]÷0.9,
=[2-2.6376]÷0.9,
=[-0.6376]÷0.9,
=-
;
(3)(20
+12.56-31
)÷299+(13
-12.25)×1
,
=(20
+12.56-31
)÷299+1.15×1
,
=(12.56-11)÷299+2.07,
=1.56÷299+2.07,
=
+2
,
=2
;
(4)
×(4.85÷
-3.6+6.15×3
)+1.75×(1
+
)+5.5,
=
×(
-3.6+
)+1.75×2+5.5,
=
×(
-3
+
)+1.75×2+5.5,
=
×(
+
)+3.5+5.5,
=
×
+9,
=
+9,
=9
.
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