问题
解答题
计算下列各式的值: (1)4x
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答案
(1)4x
(-3x1 4
y-1 4
)÷(-6x-1 3
y-1 2
)=(-12 x2 3
+1 4
y-1 4
)÷(-6 x-1 3
y-1 2
)=2 x2 3
+1 2
y-1 2
+1 3
=2x y2 3 1 3
(2)log2(47×25)+log26-log23=log247+log225+log2
=14+5+1=206 3