化简4b·3a-1/2·4b·2a-1/2·b·3a
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化简4b·3a-1/2·4b·2a-1/2·b·3a化简4b·3a-1/2·4b·2a-1/2·b·3a化简4b·3a-1/2·4b·2a-1/2·b·3a原式=12ab-4ab-(3/2)ab=8a
化简4b·3a-1/2·4b·2a-1/2·b·3a
化简4b·3a-1/2·4b·2a-1/2·b·3a
化简4b·3a-1/2·4b·2a-1/2·b·3a
原式=12ab-4ab-(3/2)ab=8ab-(3/2)ab=(15/2)ab=7.5ab.