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3x加2.1x等于1.53

x+2.1x=1.53 3.1x=1.53 x=1.53÷3.1 x=0.5 -----------------------------------------------------------------------------------------

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题目中间个括号内的1/23应该是1/53,否则不太简便哦 解: 76x(1/23-1/53)+23x(1/53+1/76)-53x(1/23-1/76)=76x1/23-76x1/53+23x1/53+23x1/76-53x1/23+53x1/76=76/23-76/53+23/53+23/76-53/23+53/76=(76/23-53/23)-(76/53-23/53)+(23/76+53/76)=1-...

53×(x-2.1)=10.6, x-2.1=10.6÷53, x-2.1=0.2, x=2.3

.x-2x-1x-2x-32x-22x-12x-22x-33x-33x-24x-53x-54x4x-35x-74x-3.=.x-21x-2x-32x-212x-22x-33x-314x-53x-54x-35x-74x-3.(第1列乘以-1,再加到第2列)=.x-210x-32x-2102x-33x-31x-23x-54x-3x-74x-3.(第1列乘以-1后,再加到第3列)=.x-210-12x-21...

76X(1/23—1/53)+23X(1/53+1/76)—53X(1/23—1/76) =76×1/23-75×1/53+23×1/53+23×1/76-53×1/23+53×1/76 =1/23×(76-53)+1/53(23-76)+1/76(23+53) =1/23×23+1/53×(-53)+1/76×76 =1-1+1=1

(1)去分母得:10-36x=-21x+6,移项合并得:-15x=-4,解得:x=415;(2)方程去括号得:14x-7-12x+3=12x+8-1,移项合并得:10x=3,解得:x=0.3.

(1)去括号,2-1+x=-2,合并移项得,x=-3;(2)去分母得,3(x+4)+15=15x-5(x-5),去括号并移项得,7x=2,系数化为1得,x=27.

(1)解:去括号,得:3x+12=5-2x+2,移项,得:3x+2x=5+2-12,合并同类项,得:5x=-5,系数化为1,得:x=-1;(2)解:去分母,得:3(x+2)=6-2(x-5),去括号,得:3x+6=6-2x+10,移项及合并,得:5x=10,系数化为1,得:x=2.

(x-1.53)/5=3/2 2(x-1.53)=15 2x=15+3.06 x=18.06÷2 x=9.03

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