(1/3+5/6)×2/3-1/5×7/5
=(2/6+5/6) ×2/3-7/25
=7/6 x2/3 -7/25
=7/9 -7/25
=7x(1/9 -1/25)
【通分】
=7x(25-9)/(9x25)
=7x16/225
=112/225
原式
=(2/6+5/6)×2/3-1/7
=7/6×2/3-1/7
=7/6×2/3-1/7
=7/9-1/7
=49/63-9/63
=40/63
(1/3+5/6)×2/3-1/5×7/5 =(2/6+5/6) ×2/3-7/25 =7/6 x2/3 -7/25 =7/9 -7/25 =7x(1/9 -1/25)【通分】=7x(25-9)/(9x25)=7x16/225 =112/225 ...
(1/3+5/6)ⅹ2/3-1/5x5/7=1/3x2/3+5/6x2/3-1/7=2/9+5/9-1/7=7/9-1/7=49/63-9/63=40/63