Cau a la ban hay tinh trong dau ngoac don truoc sau do lam nhoac vuong va lam dau ngoac nhon va tinh cac phep tinh con lai
e)
=[(25-4.3)+(9.4+16)}:5
=[(25-12)+(36+1)]:5
=[13+52]:5
=65:5
=13
d)
=177:[2.(16-9)+9.5]
=177:[2.7+45]
=177:[14+45]
=177:59
=3
c)
=205-[1200-(16-6)3]:40
=205-[1200-103]:40
=205-[1200-1000]:40
=205-200:40
=205-5
=200
b)
=307-[20:4+9]:2
=307-[5+9]:2
=307-14:2
=307-7
=300
a)
=107-{38+[7.9-4+23]}:15
=107-{38+[63-4+8]}:15
=107-{38+[59+8]}:15
=107-{38+67]}:15
=107-105:15
=107-7
=100
b) 307 - [(180 - 160) : 22 + 9] : 2
= 307 - [20 : 4 + 9] : 2
= 307 - [5 + 9] : 2
= 307 - 14 : 2
= 307 - 7
= 300
b, 307 - [(180-160):2^2+9]:2
= 307 - ( 20 : 4 + 9 ) :2
= 307 - ( 5 +9 ) :2
= 307 - 14 : 2
= 307 - 7 =300