1、(0.5+x)+x=9.8 吃7.5*2X=157x+5.3=7.42(X+X+0.5)=9.81.2x=81.63x 8 = 163x 七=4.825000+x=6xx+5.6=9.47(x-2)=2x+330次+25=853200=450+5X+Xx-0.7x=3.63x+9=271.4 8-2x=6X-0.8X=618(x-2)=2706x-12.8 X3=0.0612x-8x=4.8X+8.3=10.712x=300-4x410-3x=1703(x+0.5)=211.8x=0.972x+2x+18=78(27.5-3.5) *40.5x+8=43x 吒).756=90(200-x)弋=

2、30x+19.8=25.86x-3x=189x-40=5(x-140)叼0=45.6x=33.61.5x+18=3xx吒+9=210.1(x+6)=3.3 X0.49.8-x=3.85 X3-x 吃=848-27+5x=314(x-5.6)=1.675.6 次=12.60.273 *0.3510.5+x+21=567(6.5+x)=87.55x+12.5=32.35(x+8)=102x .5-1.25=0.753x+6=186x+18=48x+3x+10=704x-1.3 0=2.62(2.8+x)=10.43(x+2.1)=10.53(x+3)=50-x+320-9x=1.2 6.25(x-

3、3)吃=7.512x-9x=8.75x+15=606x+12.8=15.813.2x+9x=33.313(x+5)=1693.5-5x=2150 2+3x=6903x=x+1002x-97=34.20.3 X7+4x=12.52x-20=4x+4.8=7.23.4x-48=26.842x+25x=13410.5x+6.5x=514.5x-x=280.5 X16 16 X).2=4x1.5(x+1.6)=3.689x-43x=9.2X-5.7=2.15139.25 X=0.4032(x-3)=5.85x-45=100155X-2X=1816.9 咲=0.365x+7=421.2x-0.5x=6.

4、33X+0.7=523x=14x + 149x+4 *2.5 = 9123.4=2x=563.5 X2=4.2+xx+14x=654.2x+2.5x = 1344x-x=48.626 X1.5=2x+103 5x = 801.8+6x = 549x-3x=67x+7=146.7x 60.3 = 6.76x-8=46x-6=09 + 4x = 405x+x=95x+6=112x+8=16x-8=6x2x-8=1023x-14x=144/5x=201/2x-8=4x+7x=82x-6=12x-5/6=73x+7=283x-7=269x-x=1624x+x=506/7x-8=43x-8=306x+6

5、=1215+6x=278x+9=177x-9=83x-3=15-8x=49+6x=14x-56=15x-3x=47x+8=15x+9x=4+78-7x=12x+16=199-2x=12x+9=17x-30=125x+8=194+5x=98-4x=66x-21=2114-6x=810-x=86x-7=126x-3=69x=18X-5.7=2.159.25 X=0.4039 + 4x = 404x-18=13155X-2X=1816.9 吠=0.30.2x 0.4 + 0.5 = 3.75x+9=113X0.7=5X.5=2.69.4x 0.4x = 16.26-2x=113.5 X2=4.2x3

6、 5x = 8012 4x = 20x+4+8=2326 X1.5=2x1.8-6x =541/3x + 5/6x = 1.47x-12=80.5 X1616 X).2=4x6.7x 60.3 = 6.712x+34x=118x 14x=1225000+x=6xx+5.6=9.47(x-2)=2x+323x 5 X14=143200=450+5X+Xx-0.7x=3.63x+9=2712+34x=56X-0.8X=691 次=1.318(x-2)=2702214x=1212x-8x=4.8X+8.3=10.712x=300-4x(0.5+x)+x=9.8 吃7.5*2X=1515x = 37x

7、+5.3=7.42(X+X+0.5)=9.81.2x=81.63x 8 = 163x 七=4.830次+25=856x-3x=189x-40=51.4 8-2x=61.5x+18=3xx5+9=216x-12.8 3=0.065 X3-x 吃=848-27+5x=31410-3x=1700.273 *0.3510.5+x+21=563(x+0.5)=211.8x=0.972x+2x+18=780.5x+8=43x 吒).756=90(200-x)弋=30(x-140)叼0=40.1(x+6)=3.3 0.44(x-5.6)=1.67(6.5+x)=87.5(27.5-3.5) *44x=4404(x-5.6)=1.618(x-2)=27018(x-2)=27012x=300-4x75%x = 67x+5.3=7.40.1(x+6)=3.3 X).4（1） 甲數是3.5，比乙數多a,乙數是，甲、乙兩數的和是 。（2）用a元買了單價為1.8元的西瓜2千克，應找回 元。（3）比 x少5的數與a相乘的積是。（4）a的5倍減去4.8的差是。（5） a與b的和的一半是。（6） 食堂買來a千克大米，吃了 b千克，還剩千克。（7） 買20支鋼筆共付c元，每支鋼筆的價錢是 元。（8）個工地用汽車運土，每輛車運 x噸。一天上午運了 6車，下午運了 5車。這一天共運土（）噸，上午比下午多運土（）噸。（