0.7×19有9分之5＋2有4分之3×（一14）＋3.25×14
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0.7×19有9分之5＋2有4分之3×（一14）＋3.25×14
0.7×(19+5/9) ＋ (2+3/4)×(-14) ＋ 3.25×14
= 0.7×(19+5/9) ＋ (2+3/4)×(-1)×14 ＋ (3+1/4)×14
= 0.7×(19+5/9) ＋ {(2+3/4)×(-1) ＋ (3+1/4) }×14
= 0.7×(19+5/9) ＋ { -2-3/4+3+1/4 }×14
= 0.7×(19+5/9) ＋ ( 1-2/4 )×14
= 0.7×(19+5/9) ＋ ( 1/2 )×14
= 0.7×(19+5/9) ＋ 7
= 7/10×(19+5/9) ＋ 7
= 7/10×19 + 7/10×5/9 ＋ 7
= 133/10 + 35/90 ＋ 7
= (13+3/10) + 35/90 ＋ 7
= 13 + (3/10 + 35/90) ＋ 7
= 20 + (27/90 + 35/90)
= 20 + 62/90
= 20 + 31/45
即 20又45分之31
0.7×(19+5/9) ＋ (2+3/4)×(-14) ＋ 3.25×14
= 0.7×(19+5/9) ＋ (2+3/4)×(-1)×14 ＋ (3+1/4)×14
= 0.7×(19+5/9) ＋ {(2+3/4)×(-1) ＋ (3+1/4) }×14
= 0.7×(19+5/9) ＋ { -2-3/4+3+1/4 }×14
= 0.7×(19+5/9) ＋ ( 1-2/4 )×14
= 0.7×(19+5/9) ＋ ( 1/2 )×14
= 0.7×(19+5/9) ＋ 7
= 7/10×(19+5/9) ＋ 7
= 7/10×19 + 7/10×5/9 ＋ 7
= 133/10 + 35/90 ＋ 7
= (13+3/10) + 35/90 ＋ 7
= 13 + (3/10 + 35/90) ＋ 7
= 20 + (27/90 + 35/90)
= 20 + 62/90
= 20 + 31/45
即 20又45分之31
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