Ответ:
1)(4 1/5-2 3/4)*2 2/19= (21/5-11/4)2*2/19=29/20*2*2/19=29/10*2/19=29/5*1/19= 29/95
2)(5 6/7+3 5/21)2 1/10=((5+3)+(6/7+5/21))*1/5=(8+23/21)1/5=(8+1+2/21)1/5=(9+2/21)1/5=
191/21*1/5=191/105
3)(7 5/12-3 1/6)2 2/17= (89/12-19/6)2*2/17=17/4*2*2/17=1/2*2=1
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Ответ:
1)(4 1/5-2 3/4)*2 2/19= (21/5-11/4)2*2/19=29/20*2*2/19=29/10*2/19=29/5*1/19= 29/95
2)(5 6/7+3 5/21)2 1/10=((5+3)+(6/7+5/21))*1/5=(8+23/21)1/5=(8+1+2/21)1/5=(9+2/21)1/5=
191/21*1/5=191/105
3)(7 5/12-3 1/6)2 2/17= (89/12-19/6)2*2/17=17/4*2*2/17=1/2*2=1