Question

А)3/5 × 4/9=
Б)7/9×21/25=

В)5/7×(21/30-7/30)+16/21:8/7=
Г)(1/2-1/3):1/3-1/4×(3/2)=

Д)3/11×X=5

Е)X:4/17=34/39



Ж)(11/12×13/17)×(17/13×22/33)

З)65×5/13+65×4/13

Answer 1

Ответ:

А) 3/5 * 4/9 = 1/5 * 4/3 = 4/15 ;

Б) 7/9 * 21/25 = 7/3 * 7/25 = 49/75 ;

В) 5/7 * ( 21/30 - 7/30 ) + 16/21 : 8/7 = 5/7 * 7/15 + 16/21 * 7/8 = 1/3 + 2/3 = 3/3 = 1 ;

Г) ( 1/2 - 1/3 ) : 1/3 - 1/4 * 3/2 = 1/6 * 3 - 3/8 = 1/2 - 3/8 = 1/8 = 0,125 ;

Д) 3/11 * х = 5 ; |*¹¹/³ ; х=55/3=18 ⅓ ;

Е) х : 4/17 = 34/39 ; х * 17/4 = 34/39 ; |*4/17 ; х = 8/39 ; Ж) ( 11/12 * 13/17 ) * ( 17/13 * 22/33 ) = 143/204 * ( 17/13 * 2/3 ) = 143/204 * 34/39 = 11/6 * 1/3 = 11/18 ; З) 65 * 5/13 + 65 * 4/3 = 5 * 5 + 5 * 4 = 25 + 20 = 45 .