问题
解答题
用递等式计算. 75×24+836÷4 (7.6-3.6÷2)×1.5
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答案
(1)75×24+836÷4,
=1800+209,
=2009;
(2)(7.6-3.6÷2)×1.5,
=(7.6-1.8)×1.5,
=5.8×1.5,
=8.7;
(3)
×9+7÷7 16
,16 7
=
×9+7×7 16
,7 16
=(9+7)×
,7 16
=16×
,7 16
=7;
(4)
÷[1÷(5 7
-2 3
)],1 5
=
÷[1÷5 7
],7 15
=
×5 7
,7 15
=
.1 3