5/4x8+8x1/4简便，3/4÷3x3/4÷3,1/13+12/13x(5/2-1/3)
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5/4×8+8×1/4
=(5/4+1/4)×8
=6/4×8
=12
3/4÷3×3/4÷3
=(3/4×3/4)÷(3×3)
=9/16÷9
=9/16×1/9
=1/16
1/13+12/13×(5/2-1/3)
=1/13+12/13×5/12-12/13×1/3
=1/13+5/13-4/13
=2/13
=(5/4+1/4)×8
=6/4×8
=12
3/4÷3×3/4÷3
=(3/4×3/4)÷(3×3)
=9/16÷9
=9/16×1/9
=1/16
1/13+12/13×(5/2-1/3)
=1/13+12/13×5/12-12/13×1/3
=1/13+5/13-4/13
=2/13
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