问题
解答题
怎样算简便就怎样算.
|
答案
(1)
×4 9
÷1 5 4 5
=
×4 9
×1 5 5 4
=1 9
(2)(15-14×
)×4 7 8 21
=(15-8)×8 21
=7×8 21
=8 3
(3)
÷[(4 5
+1 3
)×2 5
]4 11
=
÷[4 5
×11 15
]4 11
=
÷4 5 4 15
=
×4 5 15 4
=3
(4)
×58+42÷81 8
=
×58+42×1 8 1 8
=
×(58+42)1 8
=
×1001 8
=12.5
(5)
×7 2
-5 8
÷3 2 8 5
=
×7 2
-5 8
×3 2 5 8
=(
-7 2
)×3 2 5 8
=2×5 8
=5 4
(6)
×40%+0.75×3 4 3 5
=
×3 4
+2 5
×3 4 3 5
=
×(3 4
+2 5
)3 5
=
×13 4
=3 4