Question

Jawab menggunakan caranya!​

Answer 1

Verified answer

Jawaban:

16) = (5¼ + 7½ ) : ¼

= ( 21/4 + 15/2) : ¼

= ( 21/4 + 30/4) : ¼

= 51/4 x 4/1

= 51 kg

17) = -2x + 2y -5 + 2x -12 + 8y

= -2x + 2x + 2y + 8y -5 -12

= 10y - 17

18) = -18x - 3y + 4x

= -18x + 4x - 3y

= - 14x - 3y

19) = 6p + 8 - 7p - 9

6p - 7p = - 8 + 9

-p = 1

p = -1

20) = a + 7 + 5y - 19

= a + 7 - 19 + 5y

= a - 22 + 5y

21) = 4 x ( (3x + 2)²)

= 4 x (9x² + 6x + 6x + 4)

= 4 x ( 9x² + 12x + 4)

= 36x² + 48x + 16

22) x = -2

3x + 8 = 3(-2) + 8

= -6 + 8

= 2

23) a = 2 ; y = -3 ; z = -5

= 2x + 3y + 2z

= 2( 2) + 3( -3) + 2( -5)

= 4 -9 -10

= -15

24) x = ayam dan sapi

x + 4x = 66

5x = 66

25) ( 25 - 7) - 3 = 18 - 3 = 15

26) 8 - 2x = x + 17

-2x - x = 17 - 8

-3x = 9

x = 9/-3

x = -3

27) 31.500 : 7 = 4.500

5 x 4.500 = 22.500

100.000 - 22.500 = 77.500

28) x = matematika

x < 20

29) 2x(50) = 100

30) x > -6

x = { -5,-4,-3,-2,-1, 0.....}

31) Soal 50 buah

Menjawab 45

Benar 43

= ( 5 x 0 + 43 x 2 + 2 x -1)

= 0 + 46 - 2

= 44

32) 3/8 ..... 0,245

375/1000 > 245/1000

maka 3/8 > 0,245

33) 1¾ + 2⅜ = 7/4 + 19/8

= 14/8 + 19/8

= 33/8

= 4⅛ meter

34) 7x - 3 = 7(-5) - 3

= -35 - 3

= -38

35) 2x - 5 = 7 - 4x

2x + 4x = 7 + 5

6x = 12

x = 12/6

x = 2