已知lg2=0.3010,lg3=0.4771,则lg5= ,lg12= ,log(1/2)90=

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已知lg2=0.3010,lg3=0.4771,则lg5=,lg12=,log(1/2)90=已知lg2=0.3010,lg3=0.4771,则lg5=,lg12=,log(1/2)90=已知lg2=

已知lg2=0.3010,lg3=0.4771,则lg5= ,lg12= ,log(1/2)90=
已知lg2=0.3010,lg3=0.4771,则lg5= ,lg12= ,log(1/2)90=

已知lg2=0.3010,lg3=0.4771,则lg5= ,lg12= ,log(1/2)90=
lg5
=lg(10/2)
=lg10-lg2
=1-0.3010
=0.6989;
lg12
=lg(4*3)
=lg4+lg3
=lg2²+lg3=
2lg2+lg3
=2*0.3010+0.4771
=1.0791;
log(1/2)90
=lg90/lg(1/2) [换底公式]
=lg(3²*10)/lg(1/2)
=(lg3²+lg10)/(lg1-lg2)
=(2lg3+1)/(0-lg2)
=(2*0.4771+1)/(-0.3011)
=-6.4902

已知lg2=0.3010 lg3=4771 求lg6 已知lg2=0.3010 lg3=0.4771,求lg4^10 已知lg2=a,lg3=b.求lg3/2 lg2+lg3=? (lg2/lg3+lg2/2lg3)*(lg3/2lg2+lg3/3lg2)=? lg2=0.3010 lg3=0.4771 lg15 =lg3+lg5 =lg3+1-lg2 =1.7781 中lg3+lg5如何得到lg3+1-lg2 的,没看懂已知lg2=a,lg3=a,则lg2/3等于（） lg3=b lg2*lg3=?lg5/lg2=? 3lg2*5lg3=? 已知lg2=0.3010,lg3=0.4771 求 lg32=?lg3/2=?lg根号3/2=? 已知lg2=0.3010,lg3=0.4771,计算:(1)lg9/2;(2)lg3.6;(3)lg根号6/2 已知lg2=a,lg3=b,log3 6=? 已知lg2=a,lg3=b求log3(4) 已知lg2=a,lg3=b,求log12 5 已知lg2=a,lg3=b,求lg5 已知lg2=a lg3=b 则lg12等于已知lg2=a,lg3=b,lg9/50等于已知lg2＝a,lg3=b.求lg5