题目内容
计算:
(1)(2
)
-(-9.6)0-(3
)-
+(1.5)-2;
(2)(lg5)2+lg2×lg50.
(1)(2
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(2)(lg5)2+lg2×lg50.
(1)(2
)
-(-9.6)0-(3
)-
+(1.5)-2=
-1-(
)-2+(
)-2=
.
(2)(lg5)2+lg2×lg50
=(lg5)2+lg2×lg(25×2)
=(lg5)2+lg2×(2lg5+lg2)
=(lg5)2+2lg2×lg5+(lg2)2
=(lg2+lg5)2
=1
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(2)(lg5)2+lg2×lg50
=(lg5)2+lg2×lg(25×2)
=(lg5)2+lg2×(2lg5+lg2)
=(lg5)2+2lg2×lg5+(lg2)2
=(lg2+lg5)2
=1
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