题目内容
(1)(2a
b
)(-6a
b
)÷(-3a
b
);
(2)log3
+lg25+lg4+7log72.
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(2)log3
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(1)原式=2×(-6)÷(-3)a
+
-
b
+
-
=4a;
(2)原式=log33
-1+lg(25×4)+2
=-
+lg102+2
=
.
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(2)原式=log33
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=-
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=
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