(1/2-(3/4-3/5))/(7/10)
=(1/2-(3/4-3/5))*10/7
=5/7-15/14+6/7
=11/7-15/14
=(22-15)/14
=1/2
4/7*3/8+3/7/(8/3)
=4/7*3/8+3/7*(3/8)
=(4/7+3/7)*3/源歼8
=3/稿锋8
1/6/(1/2-1/5）*3/10
=1/6/(3/10)*3/10
=1/键裂晌6
(1-50%)x ﹦36
0.5X=36
X=72
2x-1/3+2/3=3
2X=8/3
X=4/3
(16/15)/(15/14)
=16*14/(15*15)
=224/225
太乱了，看起来费劲，
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