выполните действия: 7-3/5+2 7/9 ; 8 7/15-5 3/4+6
- 1) (7 3/5 — 2 4/15)*9/32=(7 9/15 — 2 4/15)*9/32 = (5 5/15)*9/32 = (5 1/3)*9/32 = (16/3)*(9/32) = (16*9)/(3*32) = 3/2 = 1,52) (11/24 + 1/6)* 1 3/5= (11/24 + 4/24)*8/5 =(15/24)*(8/5) = (15*8)/(24*5)= 3/3 = 13) (5 1/2 + 2 3/5)*5/9= (5 5/10 + 2 6/10)*5/9 = (8 1/10) * 5/9 = (81*5)/(10*9) = 9/2 = 4,54) (7 — 2 5/16)*4/25= (6 16/16 — 2 5/16)*4/25 = (4 11/16)*4/25 = (75*4)/(16*25) = 3/4 = 0,75выполните умножение: 1) 1 3/7 * 2 4/5 * 3/4= 10/7 * 14/5 * 3/4 = (10*14*3)/(7*5*4) = 32) 3 3/4 * 5/12 * 8/15= 15/4 * 5/12 * 8/15 = (15*5*8)/(4*12*15) = 5/63) 1 5/6 * 8 2/11 * 4/9= 11/6 * 90/11 * 4/9 = (11*90*4)/(6*11*9) = 20/3 = 6 2/3 4) 2 1/27 * 3 1/5 * 7 4/11= 55/27 * 16/5 * 81/11 = (55*16*81)/(27*5*11) = 48решите умножение: 1) 4(х-1/2)=0 х -1/2 = 0 х = 1/22) 8(х — 3/14)=0 х — 3/14 = 0 х = 3/143) (х — 1 3/4)*2/3=0 х — 1 3/4 =0 х = 1 3/44) (х — 2 1/4)*4/5=0 х — 2 1/4 = 0 х = 2 1/45) 12(х — 1 3/10 * 5/6)=0 х — 1 3/10 * 5/6 = 0 х — 13/10 * 5/6 = 0 х — (13*5)/(10*6) = 0 х — 13/12 = 0 х = 1 1/12
6) 9(х — 3 1/2 * 4/7)=0 х — 3 1/2 * 4/7 = 0 х — 7/2 * 4/7 = 0 х — (7*4)/(2*7) =0 х — 2 =0 х = 2