在□里填上适当的数,○里填上“+”或“-”.??
18.6+4.7+1.4=18.6+□+4.7??????
12.64+0.63+0.37=12.64+(□○□)????????
48.72-0.2-0.8=48.72-(□○□)??????
195.4-(12.9+87.1)=195.4-□○□
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解:①18.6+4.7+1.4=18.6+1.4+4.7;
②12.64+0.63+0.37=12.64+(0.63+0.37),
?
③48.72-0.2-0.8=48.72-(0.2+0.8),
?
④195.4-(12.9+87.1)=195-12.9-87.1,
故