50道乘除法解方程及答案.docx

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1、50道乘除法解方程及答案(1)(0.5+x)+x=9.820.5+2x=4.90.5+2x-0.5=4.9-0.52x=4.422=4.42X=2.2(2)2(X+X+0.5)=9.82+2x+l=9.84x+l-l=9.8-l4x=8.84x4=8.84X=2.225000+x=6x25000+x-x=6-5x=250005x5=250005X=50003200=440+5X+X6+440=3200+6x+450-450=3200-4406x=27606x6=27606X=4600.2x0.2=60.2X=3O(6)12x-8x=4.84x=4.844=4.84X=1.2(7)7.5+2X=

2、152+7.5-7.5=15-7.52x=7.52x2=7.52X=3.75(8)1.2x=81.61.2x1.2=81.61.2X=68(9)x+5.6=9.4X+5.6-5.6=9.4-5.6X=3.8(10)x-0.7x=3.60.3x=3.60303=3.60.3X=12(ll)91x=1.31.3x1.3=911.3X=70(12)X+83=10.7X+8.3-8.3=10.7-8.3X=2.4(13)15x=315x15=315X=O.2(14)3x-8=163x-8+8=16+83x=243x3=243X=8(15)3x+9=273x+9-9=27-93x=183x3=1833x

3、=6(16)18(-2)=27018x-36=27018x18=30618X=17(17)12x=300-4x12x+4x=300-4x+4x16x=30016x16=30016X=18.75(18)7x+5.3=7.47+5.3-5.3=7.4-5.37x=2.17x=2.17x7=2.17X=0.3(19)35=4.83x5x5=4.853x=243x3=243X=8(20)30+25=8530x+25-25=85-2530=60x60x60=3060X=0.5(21)1.48-2x=611.2-2x+2x=6+2x11.2=6+2x2x+6-6=11.2-62x=5.22x2=5.22X

4、=2.6(22)6-12.83=0.066x-38.4=0.066x=38.4666=38.466X=6.41(23)410-3x=170410-3+3x=170+3x170+3x=4103x+170-170=410-1703=2403x3=24O3X=803x+1.5-1.5=21-1.53x=19.53x3=19.53X=6.5(25)0.5x+8=430.5x+8-8=43-80.5x=350.5x0.5=350.5X=70(26)6x-3x=183x=183x3=183X=6(27)7(6.5+x)=87.57x+45.5-45.5=87.5-45.57x=427x7=427X=6(2

5、8)0.273x=0.35x=0.2730.35X=0.781.8x1.8=0.9721.8X=0.54(30)0.756=900.7560.756=900.756X=68.04(31)0.Mx+6)=3.30.40.1x+0.6=1.320.1x+0.6-0.6=1.32-0.60.1x=0.720.1x0.1=0.720.1X=7.2+(32)+(27.5-3.5)x=424x=4x=244X=6(33)9x-40=59x-40+40=5+409x=459x9=459X=5(34)x5+9=21x5+9-9=21-9x5=12(35)48-27+5x=315x+21-21=31-215x=

6、10X=2(36)10.5+x+21=56x+31.5-31.5=56-31.5x=24.5(37)x+2x+18=783+18-18=78-183x=603x3=603X=20(38)(200-x)5=30(200-x)5x5=305200-x=150200-x+x=150+x150+=200X+150-150=200-150X=5O(x-140)7070=470X-140=280X-140+140=280140X=420(40) +20-9x=29x=20-29x=189x9=189X=2(41)19.8=25.8X+19.8-19.8=25.8-19.8X=6(42) 5.6x=33.6

7、5.6x5.6=33.65.6X=6+(43)+9.8-x=3.89.8-x+x=3.8+X3.8+x=9.8X=9.8-3.8X=6(44)75.6x=12.6X=75.612.6X=6(45)5x+12.5=32.35x=19.855=19.85X=3.96(46)5(x+8)=1025+40=1025x+40-40=102-405x=6255=625X=12.4(47)x+3x+10=704x+10=704x+10-10=70-104x=604x4=604X=15(48) +3(x+3)=50-x+33+9=53-x3x+x+9-9=53-x+x-94x=44X=Il(49)(50) 3.5-5x=2+3.5-5x5x=2+55x+2=3.55x+2-2=3.5-25x=1.5X=0.3