题目内容
求值:
(1)(lg5)2+lg2•lg50;
(2)(2
)
-(-9.6)0-(3
)-
+(1.5)-2.
(1)(lg5)2+lg2•lg50;
(2)(2
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(1)(lg5)2+lg2•lg50
=(lg5)2+lg2•(lg5+1)
=(lg5)2+lg2•lg5+lg2
=lg5(lg5+lg2)+lg2
=lg5+lg2
=1.
(2)(2
)
-(-9.6)0-(3
)-
+(1.5)-2
=(
)
-1-(
)-
+(
)2
=
-1-(
)2+(
)2
=
.
=(lg5)2+lg2•(lg5+1)
=(lg5)2+lg2•lg5+lg2
=lg5(lg5+lg2)+lg2
=lg5+lg2
=1.
(2)(2
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=(
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=
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=
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