1楼：买昭懿
(x+1)/4=75
x+1=4*75=300
x=300-1 = 299
5/8x÷2/3=1又1/3
5/8x÷2/3=4/3
5/8x=4/3*2/3 = 8/9
x = 8/9*8/5 = 64/45
2楼：校椹风云
x+1/4=75
x=74又3/4
5/8x÷2/3=1又1/3
5/8x=1又1/3×2/3
5/8x=8/9
x=64/45
3楼：蜗锶
1：x+1/4＝75
x＝75-1/4
x＝74又3/4
2：5/8x÷2/3＝4/3
5/8x＝8/9
x＝64/45
2-15/16÷5/7÷3/4 9/20÷[1/2×(2/5+4/5)] x-5/8x=1
4楼：咨询霍老师
2-15/16÷
5/7÷3/4
=2- 21/ 16 ÷3/4
=2- 7/4
=1/4 =0.25
9/20÷[1/2×(2/5+4/5)]
=9/20/[1/2×6/5]
=9/20×5/3
=3/4
x-5/8x=1/3×45
x-5/8x=15
3/8x=15
x=15÷8/3
x= 40
1/2x-1/3x+3/5x+2/5=5
1/6x +3/5x+2/5=5
23/30x+2/5=5
23/30x=5-2/5
23/30x=23/5
x=23/5 ÷23/30
x=60.8：4=x：8
0.8 ÷4=x ÷8
0.2=x ÷8
x=0.2×8
x=1.6
5楼：兖矿兴隆矿
2-15/16÷5/7÷3/4
=2-15/16*7/5*4/3
=2-7/4
=1/4
9/20÷[1/2×(2/5+4/5)]
=9/20/[1/2*6/5]
=9/20*5/3
=3/4
x-5/8x=1/3×45
3x/5=15
x=25
1/2x-1/3x+3/5x+2/5=5
(1/2-1/3+3/5)x=4.6
23x/30=4.6
x=6.9
0.8：4=x：8
4x=6.4
x=1.6
6楼：紫云千雪
1、2-15/16÷5/7÷3/4
=2-15/16*7/5*4/3
=2-7/4
=8/4-7/4
=1/4
2、9/20÷[1/2×(2/5+4/5)]=9/20/[1/2*6/5]
=9/20/3/5
=9/20*5/3
=3/4
3、x-5/8x=1/3×45
3/8x=15
x=15*8/3
x=40
4、1/2x-1/3x+3/5x+2/5=5(1/2-1/3+3/5)x=5-2/5
23/30x=23/5
x=65、0.8：4=x：8
4x=6.4
x=1.6
解下列方程：（1）4/3-8x=3-11/2x;(2)0.5x-0.7=6.5-1.3x;（3）1/6（3x-6)=2/5x-3;(4)(1/2x)/3=(3x+1)-3; 55
7楼：我姓郭我姓过
8x-11/2x=4/3-3
5/2x=-5/3
x=-5/3÷5/2
x=-2/3
1.3x+0.5x=0.7+6.5
1.8x=7.2
x=41/6(3x-6)=2/5x-3 两边乘305（3x-6）=12x-90
15x-30=12x-90
15x-12x=30-90
3x=-60
x=-20
1-2x/3=3x+1/7-3
7(1-2x)=3(3x+1)-3*21
7-14x=9x+3-63
23x=67
x=67/23
5/4x8+8x1/4简便，3/4÷3x3/4÷3,1/13+12/13x(5/2-1/3)
8楼：莹星
5/4×
8+8×1/4
=(5/4+1/4)×8
=6/4×8
=123/4÷3×3/4÷3
=(3/4×3/4)÷(3×3)
=9/16÷9
=9/16×1/9
=1/16
1/13+12/13×(5/2-1/3)
=1/13+12/13×5/12-12/13×1/3=1/13+5/13-4/13
=2/13
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