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(1)0.2+0.5=
(2)8.4-3=
0.17÷0.2=
5.4÷1.8=
3.4÷0.2=
(1)0.3×0.04=
(2)=
(3)÷60%=
(4)13.8-6.9-3.1=
(5)×÷×=