0.75*4.21-0.21*0.75-0.75的简便计算

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0.75*4.21-0.21*0.75-0.75的简便计算0.75*4.21-0.21*0.75-0.75的简便计算0.75*4.21-0.21*0.75-0.75的简便计算=0.75*(4.21-0

0.75*4.21-0.21*0.75-0.75的简便计算
0.75*4.21-0.21*0.75-0.75的简便计算

0.75*4.21-0.21*0.75-0.75的简便计算
=0.75*(4.21-0.21)-0.75
=0.75*4-0.75
=3-0.75
=2.25

=0.75*(4.21-0.21-1)
=0.75*3
=2.25

=0.75*4.21-0.21*0.75-0.75
=0.75*(4.21-0.21-1)
=0.75*(4+0.21-0.21-1)
=0.75*(4-1)
=0.75*3
=3/4*3
=9/4

0.75*4.21-0.21*0.75-0.75
=0.25*3*(4.21-0.21)-0.75
=0.25*4*3-0.75
=1*3-0.75
=3-0.75
=2.25