题目内容
计算下面各题,能简便的要写出简算过程.
①
÷
×
②
×
+
÷
③(
+
)×15-
④[1-(
+
)]÷
⑤(
+
)×11×17
⑥
÷4-0.25×
①
②
③(
④[1-(
⑤(
⑥
解:
①
÷
×
,
=
×
,
=
;
②
×
+
÷
,
=
×
+
×
,
=(
+
)×
,
=1×
,
=
;
③(
+
)×15-
,
=
×15+
×15-
,
=1+
﹣
,
=1-(
-
),
=1-0,
=1;
④[1-(
+
)]÷
,
=[1-
]÷
,
=
÷
,
=
;
⑤(
+
)×11×17,
=(
+
)×(11×17),
=
×(11×17)+
×(11×17),
=5×17+9×11,
=85+99,
=184;
⑥
÷4-0.25×
,
=
×
-
×
,
=
×(
﹣
),
=
×
,
=
①
=
=
②
=
=(
=1×
=
③(
=
=1+
=1-(
=1-0,
=1;
④[1-(
=[1-
=
=
⑤(
=(
=
=5×17+9×11,
=85+99,
=184;
⑥
=
=
=
=
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