99乘50分之21得几
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99乘50分之21得几
99乘50分之21得几
99乘50分之21得几
99x21/50
=(100-1)x21/50
=100x21/50-21/50
=42-21/50
=41又29/50
99x21/50=2079/50=41.58
99乘50分之21得几
99乘50分之21得几
99乘50分之21得几
99x21/50
=(100-1)x21/50
=100x21/50-21/50
=42-21/50
=41又29/50
99x21/50=2079/50=41.58