7/2x3/4-3/2÷4/5。脱试计算,能简算要简算
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7/2x3/4-3/2÷4/5
=7/2x3/4-3/2x5/4
=(7/2-5/2)x3/4
=1x3/4
=3/4
7/2x3/4-3/2÷4/5
=21/8-3/2x5/4
=21/8-15/8
=6/8
=3/4
=7/2x3/4-3/2x5/4
=(7/2-5/2)x3/4
=1x3/4
=3/4
7/2x3/4-3/2÷4/5
=21/8-3/2x5/4
=21/8-15/8
=6/8
=3/4
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