Опубликовано 13.06.2017 по предмету Математика от Гость >> <<

Помогите решить 169 номер пожалуйста

Ответ оставил Гость

А)1.2/5 × (-2.1/7) × 1/6 × x = 4.1/2 × 17/18 × 1.2/34;
7/5 × (-15/7) × 1/6 × x = 9/2 × 17/18 × 36/34;
(-3) × 1/6 × x = 17/4 × 36/34;
(-1/2) × x = 9/2;
x = 9/2 ÷ (-1/2) = 9/2 ÷ (-2/1);
x = -9
Б)3.1/8 × (-1.3/5) × (-4/15) × (-x) = 2.2/17 × 3.7/9 × (-15/16);25/8 × (-8/5) × (-4/15) × (-x) = 36/17 × 34/9 × (-15/16);(-5) × (-4/15) × (-x) = 8 × (-15/16);4/3 × (-x) = (-15/2);-x = (-15/2) ÷ 4/3 = (-15/2) ÷ 3/4;-x =(-45/8) = (-5.5/8);x = 5.5/8В) (-2.3/8) × (-16/57) × 1.1/5x = 7.8/9 × 33/71 × (-1.2/5);(-19/8) × (-16/57) × 6/5x = 71/9 × 33/71 × (-12/5);38/57 × 6/5x = 33/9 × (-12/5);38/57 × 6/5x = (-132/15);6/5x = (-132/15) ÷ 38/57 = (-132/15) ÷ 57/38;6/5x = (-3762/285);x = (-3762/285) ÷ 6/5 = (-3762/285) ÷ 5/6 = (-627/57) = 11Г) (-2.7/16) × (-3.9/13) × (-17/24) × (-x) = (-2.5/6) × 4.1/2 × (-1.3/5);(-39/16) × (-48/13) × (-17/24) × (-x) = (-17/6) × 9/2 × (-8/5);9 × (-17/24) × (-x) = (-51/4) × (-8/5);(-51/8) × (-x) = 102/5;-x = 102/5 ÷ (-51/8) = 102/5 ÷ (-8/51) = - 16/5;x = 16/5 = 3.1/5