3.21*55+32.1-4.5简算

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3.21*55+32.1-4.5简算3.21*55+32.1-4.5简算3.21*55+32.1-4.5简算3.21*55+32.1*4.5=3.21*55+3.21*45=3.21*(55+45)=

3.21*55+32.1-4.5简算
3.21*55+32.1-4.5简算

3.21*55+32.1-4.5简算
3.21*55+32.1*4.5
=3.21*55+3.21*45
=3.21*(55+45)
=3.21*100
=321