622 Вычислите 1 и 3. . . . . . . .

Question

622 Вычислите 1 и 3. . . . . . . .

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Answer 1

3)0,75:(-3/20)-8,4:(-2/3)=3/4:(-3/20)-42/5:(-2/3)=-3/4*20/3+42/5*3/2=-5+21/5*3=-5+63/5=38/5
1)=(81/8-17):11/4-38/5=(-55/8):11/4-38/5=-55/8*4/11-38/5=-5/2-38/5=-101/10