求未知数x的值(x+4)÷5=61.2×(x+5)=14.44.2x÷1.6-14=0.175(10-7.5)x=0.125×85x-20%x=19.281x-342=76(x-2)0.3x+7x-0.25x=21.15x÷1右5/18=2右8/231右2/3-1右7/30x=1右1/201/2x+1/3x=4

请稍等
(x+4)÷5=6
x+4=30
x=26
1.2×(x+5)=14.4
x+5=12
x=7
4.2x÷1.6-14=0.175
4.2x÷1.6=14.175
4.2x=22.68
x=5.4
(10-7.5)x=0.125×8
2.5x=1
x=0.4
5x-20%x=19.2
4.8x=19.2
x=4
81x-342=76(x-2)
81x-342=76x-152
5x=190
x=38
0.3x+7x-0.25x=21.15
7.05x=21.15
x=3
x÷1右5/18=2右8/23
x÷23/18=54/23
x=972/529
1右2/3-1右7/30x=1右1/20
5/3-37/30x=23/20
37/30x=31/60
x=31/74
1/2x+1/3x=4
5/6x=4
x=24/5