简便算法：7分之3×6分之1+7分之4×6分之5=

15+32×1.25%= 9分之5×13分之7÷（9分之7×2分之1）=5分之3+5分之2×8分之3=

3/7x1/6+4/7×5/6
=1/7x(3x1/6+4×5/6)
=1/7x(3/6+20/6)
=1/7x23/6
=23/42

15+32×1.25%
=15+4x(8x1.25%)
=15+4x0.1
=15.4

5/9x7/13÷（7/9×1/2）
=5/9x7/13x9/7×2/1
=5/13x2
=10/13

3/5+2/5×3/8
=3/5+3/5×2/8
=3/5x(1+1/4)
=3/5x5/4
=3/4

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