-50%????????60%×÷5125%X-X=28????????(1+40%)X=98??????????1-20%X=1+20%X=60%X+25=40??

发布时间:2020-08-09 08:39:37

-50%????????60%×÷5125%X-X=28????????(1+40%)X=98??????????1-20%X=1+20%X=60%X+25=40????????1-25%X=X-25%X=2X+30%X=9.280%X+12=40?????????X-20%X=16?????????X+30%X=65?????1-X=.

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解:
(1)-50%=0.125;
(2)60%×=0.5;
(3)1-=;
(4)÷5=;
(5)+=1;
(6)-=;
(7)125%X-X=28,
?????? 0.25X=28,
?0.25X÷0.25=28÷0.25,
?????????? X=112;

(8)(1+40%)X=98,
????????? 1.4X=98,
???? 1.4X÷1.4=98÷1.4,
???????????? X=70;

(9)1-20%X=,
1-20%X+20%X=+20%X,
???? +20%X=1,
?? +20%X-=1-,
??????? 20%X=0.75,
?? 20%X÷20%=0.75÷20%,
?????????? X=3.75;

(10)1+20%X=,
??? 1+20%X-1=-1,
??????? 20%X=-0.75,
?? 20%X÷20%=-0.75÷20%,
?????????? X=-3.75;

(11)60%X+25=40,
?? 60%X+25-25=40-25,
???????? 60%X=15,
??? 60%X÷60%=15÷60%,
??????????? X=25;

(12)1-25%X=,
?1-25%X+25%X=+25%X,
??????+25%X=1,
?? +25%X-=1-,
??????? 25%X=0.25,
?? 25%X÷25%=0.25÷25%,
???????????X=1;

(13)X-25%X=,
?????? 0.75X=,
?0.75X÷0.75=÷0.75,
???????????X=1;

(14)2X+30%X=9.2,
???????? 2.3X=9.2,
??? 2.3X÷2.3=9.2÷2.3,
??????????? X=4;

(15)80%X+12=40,
?? 80%X+12-12=40-12,
???????? 80%X=28,
????80%X÷80%=28÷80%,
??????????? X=35;

(16)X-20%X=16,
??????? 0.8X=16,
?? 0.8X÷0.8=16÷0.8,
?????????? X=20;

(17)X+30%X=65,
??????? 1.3X=65,
???1.3X÷1.3=65÷1.3,
?????????? X=50;

(18)1-X=,
? 1-X+X=+X,
???? +X=1,
? +X-=1-,
?????? X=,
???X÷=÷,
?????? ?X=.
解析分析:(1)、(2)、(3)、(4)、(5)、(6)根据分数和百分数加减乘除的计算方法进行计算;
(7)、(8)、(9)、(10)、(11)、(12)、(13)、(14)、(15)、(16)、(17)、(18)根据等式的性质进行解方程.

点评:本题主要考查解方程,根据等式的性质进行解答.
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