435 − 167 − 89 − 435 − 89
=(435 − 435) − (167 + 89 + 89)
= −(256 + 89)
= -345
----------------------------------
(-67) + 125 + (-33) + 75
= [(-67) + (-33)] + (125 + 75)
= -100 + 200
= 100
435 - 167 - 89 - 435 - 89
bo dau ngoac roi tinh
(-7264) + (1543 + 7264)
(435 - 167 - 89) - (435 - 89)
TÍNH BẰNG CÁCH HỢP LÍ 
☠
a) -3752-( 29-3632)-51
b) 4524-(12-3999)-(4524+3999)
c) (-116+124 )-(215-116+124)
d)(-435+167+89)-(-435+89)
3.tính nhanh
a)(1456+323)-1456
b)(-1999)-(-234-1999)
c)(116+124)+(215-116-124)
d)(435-167-89)-(435-89)
Tinh nhanh
a.(1456+23)-1456
b.(-1999)-(-234-1999)
c.(116+124)+(215-116-124)
d.(435-167-89)-(435-89)
(435 x 234 - 89) : (233 x 435 + 346)
258-[122-(-358+322)]
(435.167.89)-(435-89)
tìm xEN biết :
a) ( x - 15 ) - 75 = 0
b) 575 - ( 6x + 70 ) = 445
c) 315 + ( 125 - x ) = 435
giúp mk nhé mn ơi
a/(x-15)-75=0
b/575-(6x+70)=445
c/315+(125-x)=435
d/x-105:21=15
e/(x-105):21=1
