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3x加2.1x等于1.53

76x(1/23—1/53)十23x(1/53+1/76)—53x(1/23一1/76) =76/23-76/53+23/53+23/76-53/23+53/76 =76/23-53/23+53/76+23/76-76/53+23/53 =23/23+76/76-53/53 =1+1-1 =1

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

等一下

(1)x-34x=56, (1-34)x=56, 14x=56, 14x×4=56×4, x=103;(2)1.53=12?1.5x, 0.5=10.5x, 0.5x=10.5, 0.5x÷0.5=10.5÷0.5, x=21.

8/55

(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)去分母得:x-5=2x-3,解得:x=-2,经检验x=-2是分式方程的解;(2)去分母得:x-2x+6=3,解得:x=3,经检验x=3是增根,分式方程无解.

5.3x+1.4=1.2 5.3x=-0.2 x=-2/53 或者约等于0.04(保留两位小数)

.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...

73X2.9-58+7.1x53 =73*2.9-20*2.9+7.1*53 =2.9*(73-20)+7.1*53 =53*2.9+53*7.1 =53*(2.9+7.1) =53*100 =5300 31*68+62*16 =31*68+31*32 =31*(68+32) =31*100 =3100 4.26x32.7+35.2×3.27+0.222X327 =32.7*4.26+32.7*3.52+32.7*2.22 =32.7*(4.26+3...

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