Tinh
D=57.(49-19)-57.(24+49)
57.(49-16)-57.(24+49=????
57.(49-16)-57.(24+49)=?
57 . 33 - 57 . 73
= 57 . ( 33 - 73 )
= 57 . (-40)
= -2280
Học Tốt !
Trl :
57.(49-16)-57.(24+49= - 2280
Học tốt !
57(49-16)-57.(24+49)
=57.49-57.16-57.24-57.49
=(57.49-57.49)-(57.16+57.24)
=0-57.(16+24)
=0-57.40
=0-2280
=-2280
Tính hợp lý:
45-58+(-45)+(+58)-3
(-57)-(-12)+3-(-57)
-(-24)-(-30)+(-24)-30+8
-(-12)+(+19)-(+12)+8-19
47-(-53)+(-47)-(+53)
-(+28)+32-(-28)+(-34)
15-(+72)+(-15)+(+72)
20-(+46)+(-25)-(-46)
28-(-32)+(-28)-32+5
-75+(-49)+(+75)+49-12
Giúp e vs ạ
45-58+(-45)+(+58)-3=45-58-45+58-3=(45-45)+(58-58)-3=-3
(-57)-(-12)+3-(-57)=-57+12+3+57=(-57+57)+12+3=15
-(-24)-(-30)+(-24)-30+8=24+30-24-30+8=(24-24)+(30-30)+8=8
-(-12)+(+19)-(+12)+8-19=12+19-12+8-19=(12-12)+(19-19)+8=8
47-(-53)+(-47)-(+53)=47+53-47-53=(47-47)+(53-53)=0
-(+28)+32-(-28)+(-34)=-28+32+28-34=(-28+28)-(34-32)=-2
15-(+72)+(-15)+(+72)=15-72-15+72=(15-15)+(72-72)=0
20-(+46)+(-25)-(-46)=20-46-25+46=(20-25)+(46-46)=-5
28-(-32)+(-28)-32+5=28+32-28-32+5=(28-28)+(32-32)+5=5
-75+(-49)+(+75)+49-12=-75-49+75+49-12=(-75+75)+(49-49)-12=-12
\(...=45-58-45+58-3=-3\)
\(...=-57+12+3+57=15\)
\(...=24+30-24-30+8=8\)
\(...=12+19-12+8-19=8\)
\(...=47+53-47-53=0\)
\(...=-28+32+28-34=-2\)
\(...=15-72-15+72=0\)
\(...=20-46-25+46=-5\)
\(=...28+32-28-32+5=5\)
\(...=-75-49+75+49-12=-12\)
Tính các tổng sau:
a) 39 + 45
b) 47 + 49
c) 61 - 28
d) 86 - 19 + 24
e) 39 + 57
f) 34 + 57
g) 45 + 39
h) 48 + 36 -51
tính nhanh : (57 - 28 + 49) - (49 + 57)
\(=57-28+49-49-57\\ =\left(57-57\right)+\left(49-49\right)-28=0+0-28=-28\)
115-(-85)+35-(46+35)
5.(-9).2(-7).(-2020) mũ 0
57.(49-16)-57.(24+49)
đây là bài tính nhanh nếu có thể
115-(-85)+35-(46+35)
= 115 + 85 + 35 - 81
= 115 + 35 + 85 - 81
= 150 + 4
= 154
5.(-9).2(-7).(-2020) mũ 0
= 5.(-9).2(-7).1
= 5.2.(-9)(-7)
= 630
57.(49-16)-57.(24+49)
= 57.[(49-16)-(24+49)]
= 57.(49-16-24-49)
=57.(49-49-16-24)
=57.(0-16-24)
=57.(-40)
=-2280
tính hợp lí nếu có thể
46+(-80)+34 115-(-85)+35-(46+35)
5.(-9).2.(-7).(-2020)0 57.(49-16)-57.(24+49)
\(46+\left(-80\right)+34=\left(46+34\right)-80=80-80=0\)
\(115-\left(-85\right)+35-\left(46+35\right)=115+85+35-46+35\)
\(=\left(115+85\right)+\left(35-35\right)-46=200+0-46=154\)
\(5\left(-9\right).2.\left(-7\right)\left(-2020\right)^0=\left(-45\right)\left(-14\right).1=630\)
\(57\left(49-16\right)+57\left(24-49\right)=57.49+57.16+57.24-57.49\)
\(=57\left(49-49+16+24\right)=57.40=2280\)
Bài 1 : Tính hợp lý
a) -15+(-22)-(-7)-|-8|
b) 120-(-80)+35-(46+35)
c) 57×(49-19)-57×(84+49)
d) 37×(-4)2+23×16+16×(-160)
1.
a = -38
b = 154
c = -5871
d = -1600
a, -15 + (-22) - (-7) - |-8|
= -15 - 22 + 7 - 8
= -37 + 7 - 8
= -30 - 8
= - 38
b, 120 - (-80) + 35 - (46 + 35)
= 120 + 80 + 35 - 46 - 35
= (120 + 80) + (35- 35) - 46
= 200 - 46
= 154
(367-24)-367
(17-600)+23
-2016 -(12-20160
(18 - 29)- (24+18-29)
-(13+49)+(13-100+49)
-23+(100-57)
a, (367-24)-367=343-367
=(-24)
b,(17-600)+23=-583+23
=(-560)
c,-2016-(12-2016)=-2016-(-2004)
=(-2016)+2004
=(-12)
d, (18-29)-(24+18-29)=(-11)-13
=(-24)
e, -(13+49)+(13-100+49)=(-62)+(-38)
=-100
f, -23+(100-57)=(-23)+43
=20
tính hợp lí nếu có thể
46+(-80)+34 115-(-85)+35-(46+35)
5.(-9).2.(-7).(-2020)0 57.(49-16)-57.(24+49)
hihihihihi giup MINH Vs
a) 46 + (-80) + 34
= (46 + 34) - 80
= 80 - 80
= 0
b) 115 - (-85) + 35 - (46 + 35)
= 115 + 85 + 35 - 46 - 35
= (115 + 85) + (35 - 35) - 46
= 200 + 0 - 46
= 154
c) 5. (-9). 2. (-7). (-2020)0
= (5. 2). [(-9). (-7)]. (-2020)0
= 10. 63. 1
= 630
d) 57. (49 - 16) - 57. (24 + 49)
= 57. 49 - 57. 16 - 57. 24 - 57. 49
= 2793 - 912 - 1368 - 2793
= (2793 - 2793) + (-912 - 1368)
= 0 + (-2280)
= -2280
Chúc bạn học tốt!!!