题目内容
计算下列各式的值:
(1)4x
(-3x
y-
)÷(-6x-
y-
)(2)log2(47×25)+log26-log23.
(1)4x
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(1)4x
(-3x
y-
)÷(-6x-
y-
)=(-12 x
+
y-
)÷(-6 x-
y-
)=2 x
+
y-
+
=2x y
(2)log2(47×25)+log26-log23=log247+log225+log2
=14+5+1=20
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(2)log2(47×25)+log26-log23=log247+log225+log2
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