tinh hop ly
47.(45-15)-47.(45+15)
tinh hop li: 77-11(30+7)
85(35-27)-35(85-27)
47(45-15)-47(15+45)
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47.(45-15)-47.(45+15). Tinh hop li
4x-15=-75-x
72-3x=5x+8. Tim x
tinh hop ly :
a, -79 . |-45| -21 |+45|
b , 29 . (23 + 15) - 23 . (29 + 15)
AI NHANH VA DUNG THI MK SE TICK CHO ^_^
a) -79.|-45| - 21.|+45|
= -79.45 - 21.45
= 45. (-79-21)
= 45. (-100)
= -4500
b) 29.(23+15) - 23.(29+15)
= 29.23 + 29.15 - 23.29 - 23.15
= (29.23 - 23.29) + (29.15 - 23.15)
= 0 + 15.(29-23)
= 15.6
= 90
47.(45-15)-47.(45+15)
\(=-47\left(45-15-45-15\right)=-47\cdot30=-1410\)
47.(45-15)-47.(45+15)=47.(45-15-45-15)
= 47.(-30)
= -1410
47.(45-15)-47.(45+15)
-1410 tui vừa làm câu này trên Violympic xong
Đúng 100%
Tick nha
thuc hien phep tinh sau mot cach hop ly:
45-|-15|:3
45 - | -15 | : 3
= 45 - 15 : 3
= 45 - 5
= 40
\(45-|-15|\div3\)
\(=45-15\div3\)
\(=45-5\)
\(=40\)
Bài 1:Tính hợp lí:
-5 + (-37 - 45 + 51) - (-37 + 51)
-(15 - 47 + 58) + (15 - 47) +3
(53 - 45 - 49) -( 53 +45 - 49)
13-15+49-13+15-48
Giúp mình vs ạ,mình đang cần gấp!!!
-5 + (-37 - 45 + 51) - (-37 + 51)
= -5 - 37 - 45 + 51 + 37 - 51
= - (5 + 45) - (37 - 37) + (51 - 51)
= - 50 - 0 + 0
= - 50
- (15 - 47 + 58) + (15 - 47 ) + 3
= - 15 + 47 - 58 + 15 - 47 + 3
= (-15 + 15) + (47 - 47) - (58 - 3)
= 0 + 0 - 55
= - 55
(53 - 45 - 49) - (53 + 45 - 49)
= 53 - 45 - 49 - 53 - 45 + 49
= (53 - 53) + (-49 + 49) - (45 + 45)
= 0 + 0 - 90
= - 90
13 - 15 + 49 - 13 + 15 - 48
= (13 - 13) + (-15 + 15) + (49 - 48)
= 0 + 0 + 1
= 1
tinh hop li:
a)1050:15-350:5+176/176
b)4320:9-8640:18+450/250
c)45*16-17/28+45*15
d)42313*846267-423133/423133*846267+423134
47(45-15)-47(45-25)
Mình có hai cách nè !!!!!!!!!!1
C1:47(45-15)-47(45-25)
=47x30-47x20
=47x(30-20)
=47x10
=470
C2:47(45-15)-47(45-25)
=47x30-47x20
=1410-940
=470
=47.45-47.15-47.45+47.25
=-47.15+47.25
=47(25-15)
=47.10
=470