问题
解答题
用简便方法计算.
|
答案
(1)
×(3 16
+4 9
)2 3
=
×3 16
+4 9
×3 16 2 3
=
+1 12 1 8
=
;5 24
(2)
÷5 14
×11 12 7 35
=
×5 14
×7 35 12 11
=
×1 14 12 11
=
;6 77
(3)
×4÷4×1 8 1 8
=
×4×1 8
×1 4 1 8
=(
×1 8
)×(4×1 8
)1 4
=
×11 64
=
;1 64
(4)
÷7 36
÷11 12 5 33
=
÷(7 36
×11 12
)5 33
=
÷7 36 5 36
=
;7 5
(5)57×3 56
=(56+1)×3 56
=56×
+1×3 56 3 56
=3+3 56
=3
;3 56
(6)
+1 8
+1 7
÷7 8 7 5
=
+1 8
+1 7 5 8
=
+1 8
+5 8 1 7
=
+3 4 1 7
=
;25 28
(7)(24+
)÷44 9
=(24+
)×4 9 1 4
=24×
+1 4
×4 9 1 4
=6+1 9
=6
;1 9
(8)
-2 3
+5 7 1 3
=
+2 3
-1 3 5 7
=1-5 7
=
;2 7
(9)
+4 25
×104 25
=
×1+4 25
×104 25
=
×(1+10)4 25
=
×114 25
=
.44 25