一、简便运算。
①、24×{4分之1+6分之1-3分之1}
=24×1/4+24×1/6-24×1/3
=6+4-8
=2
②、1+0.45÷0.9-8分之7
=1+0.5-7/8
=5/8
③、8分之3×17分之5+17分之5×62.5%
=5/17×(3/8+62.5%)
=5/17×1
=5/17
④、9分之4×【4分之3-｛16分之7-4分之1｝】
=4/9×[3/4-7/16+1/4]
=4/9×[3/4+1/4-7/16]
=4/9×9/16
=1/4
x-25%x=8分之3
(1-25%)x=3/8
3/4x=3/8
x=3/8÷3/4
x=1/2
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