问题
解答题
计算(能简便计算的要用简便方法计算) 945÷(720-21×33) 9.05-11.3×0.6-1.22
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答案
(1)945÷(720-21×33),
=945÷(720-693),
=945÷27,
=35;
(2)9.05-11.3×0.6-1.22,
=9.05-6.78-1.22,
=9.05-(6.78+1.22),
=9.05-8,
=1.05;
(3)
÷23+8 15
×1 23
,7 15
=
×8 15
+1 23
×1 23
,7 25
=(
+8 15
)×7 15
,1 23
=1×
,1 23
=
;1 23
(4)
÷[14 27
×(8 9
-1 2
)],3 8
=
÷[14 27
×8 9
],1 8
=
÷14 27
,1 9
=
×9,14 27
=
.14 3