1.当X=12时,X+19()30,60-X()32 2.X=0.2时,0.6X()0.12,X÷2()0.2

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1.当X=12时,X+19()30,60-X()322.X=0.2时,0.6X()0.12,X÷2()0.21.当X=12时,X+19()30,60-X()322.X=0.2时,0.6X()0.12,

1.当X=12时,X+19()30,60-X()32 2.X=0.2时,0.6X()0.12,X÷2()0.2
1.当X=12时,X+19()30,60-X()32 2.X=0.2时,0.6X()0.12,X÷2()0.2

1.当X=12时,X+19()30,60-X()32 2.X=0.2时,0.6X()0.12,X÷2()0.2
X+19(>)30,60-X(>)32
0.6X(=)0.12,X÷2(

当X=12时,X+19(>)30,60-X(>)32
2.X=0.2时,0.6X(=)0.12,X÷2(<)0.2

1 > >
2 = <