a,125.17.(-8).(-9)-100 b,48.49-7^2.148 c,307-((180.4^0-160):2^2+9):2 d,-1245-(136-1245)-164

2 bình luận về “a,125.17.(-8).(-9)-100 b,48.49-7^2.148 c,307-((180.4^0-160):2^2+9):2 d,-1245-(136-1245)-164”

1. a/125 x 17 x (-8) x (-9) – 100

   = [125 x (-8)] x [17 x (-9)] – 100

   = (-1000)  x (-153) -100

   = 153000 – 100

   = 152900

   b/48 x 49 – 7^2 x 148

   = 48 x 49 – 49 x 148

   = 49 x ( 48 -148)

   = 49 x (-100)

   = -4900

   c/307 – [(180 x 4^0 – 160) :2^2+9] : 2

   = 307 -[(180 x 1-160) : 2^2 + 9] : 2

   = 307- [(180 – 160) : 4 + 9] : 2

   = 307 – [ 20 : 4 + 9] : 2 

   = 307 – [5+9] : 2

   = 307 – 14 : 2

   = 307 – 7 

   = 300

   d/-1245- ( 136 – 1245 ) – 164

   = – 1245 – 136 +1245 -164

   = ( 1245  -1245 ) – (136 + 146)

   = 0 – 300

   = -300

   Trả lời
2. Giải đáp:

    a)

   125.17.(-8).(-9)-100

   =[125.(-8)].[17.(-9)]-100

   =(-1000).(-153)-100

   =153000-100

   =152900

   b)

   48.49-7^{2}.148

   =48.49-49.148

   =49.(48-148)

   =49.(-100)

   =-4900

   c)

   307-[(180.4^{0}-160):2^{2}+9]:2

   =307-[(180.1-160):4+9]:2

   =307-[(180-160):4+9]:2

   =307-(20:4+9):2

   =307-(5+9):2

   =307-14:2

   =307-7

   =300

   d)

   -1245-(136-1245)-164

   =-1245-136+1245-164

   =(1245-1245)-(136+164)

   =0-300

   =-300

    

   Trả lời