计算:1.(2 1/4)^1/2-(-9.6)^0-(3 3/8)^-2/3+(1.5)^-2 2.log3^4根号下2
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计算:1.(2 1/4)^1/2-(-9.6)^0-(3 3/8)^-2/3+(1.5)^-2 2.log3^4根号下27/3+lg25+lg4+7^ log7^2
答:
1)
(2 1/4)^1/2-(-9.6)^0-(3 3/8)^-2/3+(1.5)^-2
=(9/4)^(1/2)-1-(8/27)^(2/3)+1/(1.5)^2
=3/2-1-4/9+4/9
=1/2
2)
log3^4根号下27/3+lg25+lg4+7^ log7^2
=log3 [4√(27/3)]+lg(25*4)+2
=log3 (4*3)+lg100+2
=log3(4)+log3(3)+2+2
=log3(4)+1+4
=log3(4)+5
第二个第一项实在不太清楚,请指明后追问
再问:
再答: 2) log3 [(4次方根号下27)/3 ]+lg25+lg4+7^ log7^2 =log3 [3^(3/4)]-log3(3)+lg(25*4)+2 =3/4-1+lg100+2 =-1/4+2+2 =15/4
1)
(2 1/4)^1/2-(-9.6)^0-(3 3/8)^-2/3+(1.5)^-2
=(9/4)^(1/2)-1-(8/27)^(2/3)+1/(1.5)^2
=3/2-1-4/9+4/9
=1/2
2)
log3^4根号下27/3+lg25+lg4+7^ log7^2
=log3 [4√(27/3)]+lg(25*4)+2
=log3 (4*3)+lg100+2
=log3(4)+log3(3)+2+2
=log3(4)+1+4
=log3(4)+5
第二个第一项实在不太清楚,请指明后追问
再问:
再答: 2) log3 [(4次方根号下27)/3 ]+lg25+lg4+7^ log7^2 =log3 [3^(3/4)]-log3(3)+lg(25*4)+2 =3/4-1+lg100+2 =-1/4+2+2 =15/4
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