Надо 1+6x=77+7x , -30-8x=-16+90 , 8x+17=-3x+105 , -2(y+3)=-21+3y , 1(2-m)+3(m-3)=-13 , -1(1-3b)-4=4 - id672417320201210 от troll28 10.12.2020 02:39

Question

Математика: Надо 1+6x=77+7x , -30-8x=-16+90 , 8x+17=-3x+105 , -2(y+3)=-21+3y , 1(2-m)+3(m-3)=-13 , -1(1-3b)-4=4 , -2(7-3y)=16-16(2-y).

troll28 · Accepted Answer

1) ( 3 1/3 + 2,5 ) : ( 3 1/3 - 2,5 ) = ( 10/3 + 5/2) : ( 10/3 - 5/2 ) = ( 20/6 + 15/6) :
: ( 20/6 - 15/6) = 35/6 : 5/6 = 35/5 = 7
2) 0,4 * 7 = 2,8
ОТВЕТ 2,8

1) 3 1/3 : 10 + 0,175 : 0,35 : 1,75 - 1 11/17 * 51/56 =
а) 3 1/3 : 10 = 10/3 : 10 = 1/3
б) 0,175 : 0,35 : 1,75 = 0,5 : 1,75 = 1/2 : 1 3/4 = 1/2 : 7/4 = 2/7
в) 1 11/17 * 51/56 = 28/17 * 51/56 = 3/2
c) 1/3 + 2/7 - 3/2 = 14/42 + 12/42 - 63/42 = 26/42 - 63/42 = - 37/42
2) 0,54 * ( - 37/42 ) = 27/50 * ( - 37/42 ) = - 999/2100 = - 333/700
ответ ( - 333/700 )

Надо 1+6x=77+7x , -30-8x=-16+90 , 8x+17=-3x+105 , -2(y+3)=-21+3y , 1(2-m)+3(m-3)=-13 , -1(1-3b)-4=4 , -2(7-3y)=16-16(2-y).

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