式子0.4(a+3.5)与式子0.4a+3.5比较,结果是() A.大小相等 B.0.4(a+3.5)比式子0.4a+3.5多0.4*3.5C.0.4(a+3.5)比0.4+3.5少2.1

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式子0.4(a+3.5)与式子0.4a+3.5比较,结果是()A.大小相等B.0.4(a+3.5)比式子0.4a+3.5多0.4*3.5C.0.4(a+3.5)比0.4+3.5少2.1式子0.4(a+

式子0.4(a+3.5)与式子0.4a+3.5比较,结果是() A.大小相等 B.0.4(a+3.5)比式子0.4a+3.5多0.4*3.5C.0.4(a+3.5)比0.4+3.5少2.1
式子0.4(a+3.5)与式子0.4a+3.5比较,结果是() A.大小相等 B.0.4(a+3.5)比式子0.4a+3.5多0.4*3.5
C.0.4(a+3.5)比0.4+3.5少2.1

式子0.4(a+3.5)与式子0.4a+3.5比较,结果是() A.大小相等 B.0.4(a+3.5)比式子0.4a+3.5多0.4*3.5C.0.4(a+3.5)比0.4+3.5少2.1
0.4a+3.5-0.4(a+3.5)=3.5-0.4*3.5=2.1;选C;

c 0.4(a+3.5)=0.4a+1.4 0.4a+3.5-【0.4(a+3.5)】=0.4a+3.5-(0.4a+1.4)=2.1

C 0.4a+3.5-0.4(a+3.5)=3.5-0.4*3.5=2.1