www.5129.net > ★x+2.7=12.5 ★x.75=3.84 x÷4.2=1.5 29x+4.3...

★x+2.7=12.5 ★x.75=3.84 x÷4.2=1.5 29x+4.3...

(1)x+2.7=12.5, x+2.7-2.7=12.5-2.7, x=9.8,把x=9.8代入原方程,方程左边=9.8+2.7=12.5,右边=12.5,左边=右边,故x=9.8是原方程的解;(2)x-10.75=3.84,x-10.75+10.75=3.84+10.75, x=14.59,把x=14.59原方程,方程的左边=14.59-10.75=3.

x+2.7=75解方程解:x=75-2.7 x=72.3

12.5(4.2+x)=2.5 解:4.2+x=12.52.5 x=5-4.2 x=0.8

x-6*5=42 x+5=7 2x+3=10 6x+18=48 7x-8=6 76y-75=1 3x-1=8 51y-y=10020x=40 88-x=80 45x-50=40 30-x=12 420/x=8 x=5=17 999-x=9 13+a=28.5

(1)x+2.7=11 x+2.7-2.7=11-2.7 x=8.3 (2)x÷5=25 x÷5*5=25*5 x=125(3)2x=0.56 2x÷2=0.56÷2 x=0.28(4)15÷x=30 15÷x*x=30x 30x÷30=15÷30 x=0.5(5)330-x=120 330-x+x=120+x 120+x-120=330-120 x=210(6)x-5.5=12.5 x-5.5+5.5=12.5+5.5 x=18.

(0.5+x)+x=9.8÷2 2(X+X+0.5)=9.8 25000+x=6x 3200=450+5X+X X-0.8X=6 12x-8x=4.8 3(x+3)=50-x+3 5x+15=60 3.5-5x=2 0.3*7+4x=12.5 x÷1.5-1.25=0.75 4x-1.3*6=2.6 20-9

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