А)17÷1 8/9= б)1 1/14÷1 2/7= в) 2 1/3×3 1/5-8 4/9÷2= г)5 2/7×1 1/4+5 2/7×1 3/4= д)15 23/24×17 11/16-11 16/27×17 11/16-4 7/27×16 11/16=
271
460
Ответы на вопрос:
A) 17 ÷ 17/9 = 153/17 = 9б) 1 1/14 ÷ 1 2/7 = 15/14 ÷ 9/7 = 105/126 = 5/6в) 2 1/3×3 1/5-8 4/9÷2 = 7/3 × 16/5 - 76/9 ÷ 2 = 112/15 -76/18 = 672/90 - 380/90 = 292/90 = 146/45 = 3 11/45 г) 5 2/7×1 1/4+5 2/7×1 3/4 = 37/7 × 5/4 + 37/7 × 7/4 = 185/28 + 259/28 = 444/28 = 111/7 = 15 6/7 д) 15 23/24×17 11/16-11 16/27×17 11/16-4 7/27×16 11/16 = 383/24 × 283/16 - 313/27 × 283/16 - 115/27 × 267/16 = 266869/3456 - 30705/432 = 266869/3456 - 245640/3456 = 21229/3456 = 6 493/3456
А10=а1+9д 19=а1+9д 9д=19-а1 д=(19-а1)/9 s50=(2а1+49д)/2 *50=(2а1+49д) *25 2500= (2а1+49д) *25 2а1+49д=2500/25 2а1+49д=10049д=100-2а1 д=(100-2а1)/49 (19-а1)/9= (100-2а1)/4949(19-а1)=9 (100-2а1)931-49а1=900-18а1 -49а1+18а1=900-931 -31а1=-31 а1=-31/(-31) а1=1 д=(19-а1)/9д=(19-1)/9=18/9=2 а3=1+2*2=5 а12=1+11*2=23 а20=1+19*2=39 а3+а12+а20=5+23+39= 67
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