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小升初解方程计算题专项练习题总结78(x+5)=20.415X-=5289x2=3.151.5-10.8=2.255-X-811-X=一5X48-2=0.5-40=120518,2=,9=X,6131.1.441=2x20%=14_31:X=一82.5:5二-:X221.2:3=:X52-2X二-48.5:x=4:120.40.1:0.5-X135:x=:659O.7:18=21:x.3_3.10,4=5,0.7:18=/316:x=-4221.=8JT82-x+50%x=423-x-12=48436X482.5=12::X二T1.5:X22.421:xX:12=-:42=0.X3=22.87:512.52.51.62_三三7-x:O.25=80:-551C-x=4242X4240%x+20%x=9.61.3.l=x20.6-:x=3:1612.5%:0.25=150:X8x.25?,4o