问题 解答题
计算下列各式的值:
(1)4x
1
4
(-3x
1
4
y-
1
3
)÷(-6x-
1
2
y-
2
3
)
(2)log2(47×25)+log26-log23.
答案

(1)4x

1
4
(-3x
1
4
y-
1
3
)÷(-6x-
1
2
y-
2
3
)=(-12 x
1
4
+
1
4
y-
1
3
)÷(-6 x-
1
2
y-
2
3
)=2 x
1
2
+
1
2
y-
1
3
+
2
3
=2x y
1
3

(2)log2(47×25)+log26-log23=log247+log225+log2

6
3
=14+5+1=20

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