Wednesday, April 6, 2016

SOAL MATEMATIKA DAN PEMBAHASAN BILANGAN BULAT KELAS VII


SOAL-SOAL dan pembahasan 
  
 BILANGAN BULAT
                                                                                                                                                                                                   
KELAS VII


1.    ( - 12 ) : 3 + ( - 8 ) x ( - 5 ) =……………
A.  – 44
B.  – 36
C.  36
D.  44

2.  – 24 – 8 : ( - 2 ) x 5 =……………..
A.  – 44
B.  – 4
C.  4
D.  44

3.  – 25 + ( - 21 : 7 ) =………………
A.  – 28
B.  28
C.  – 18
D.  18

4.  ( - 4 + 6 ) x ( - 2 – 3 ) =……………
A.  – 10
B.  – 2
C.  10
D.  50

5.  ( - 20 ) + 8 x 5 – 18 : ( - 3 ) =…………
A.  – 26
B.  – 14
C.   14
D.   26


PEMBAHASAN

1.    ( - 12 ) : 3 + ( - 8 ) x ( - 5 ) = - 4 + ( 40 ) = 36………( C )

2.  – 24 – 8 : ( - 2 ) x 5 = – 24 – (8 : ( - 2 ))  5
                               = - 24 – ((- 4 ) x 5 )
                               = - 24 – ( 20 )
                               = - 24 + 20
                               = - 4…………………( B )
 
3.  – 25 + ( - 21 : 7 ) = - 25 + ( - 3 )
                           = - 25 – 3
                           = - 28……………….( A )

4.  ( - 4 + 6 ) x ( - 2 – 3 ) = 2 x ( - 5 ) = - 10………………. ( A )


5.  ( - 20 ) + 8 x 5 – 18 : ( - 3 ) =
                                          = ( - 20 ) + ( 8 x 5  ) –( 18 : ( - 3 ) )
                                          = (( - 20 ) + 40 ) – ( 6 )
                                          = 20 - 40 – ( 6 )
                                         = - 20 – 6
                                         = 26…………………… ( D )




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