tinh bang cach hop li
(-8).25.(-375).(-4).125
(-19).8+(-19).(-3)
(-137)+76.(-137)+(-137).23
24.(-21)+(-121).(-24)
tinh bang cach thuan tien nhat.
a, 1357 x 28 + 73 x 1357 - 1357.
b, 121 + 125 + 129 + 133 +137 + 141 + 145 + 149 + 153.
1357 x 28 + 73 x 1357 - 1357 = 1357 x 28 + 72 x 1357 = 1357 x ( 72 + 28 ) = 1357 x 100 = 135700 . tick đ-ú-n-g nhé
a, 1357 x (28 + 73 - 1)
= 1357 x ( 101 - 1)
= 13 57 x 100
= 135700
b, 121+125+129+133+137+141+145+149+153
=(121+149)+(125+145)+(129+141)+(137+133)+153
=170+170+170+170+153
=170x4+153
=680+153
=833
Tinh cac tong sau bang cach hop li:
a. 3784+24-3785+15
b.-2001+(1999+2001)
c.43-863-(-137-57)
(Ai tra loi nhanh nhat mk tick cho trinh bay ro rang nha)
a: 3784 + 24 - 3785 + 15
=( 3784 + 24) - (3785 + 15)
=3808 - 3800
=8
a, 3784 + 24 - 3785 + 15
= ( 3784 - 3785 ) + (24 + 15 )
= -1 + 39
=38
b,-2001 + ( 1999 + 2001)
= ( -2001+ 2001) + 1999
=0 + 1999
=1999
c, 43 - 863 -(- 137 -57)
= 43 - 863 + 137 + 57
= (43 + 57 ) + (-863 + 137 )
= 100 + (- 726 )
=-626
a, 3784 + 24 - 3785 + 15
=( 3784 - 3785 ) + ( 24 + 15 )
= -1 + 39
= 38
b, -2001 + ( 1999 + 2001 )
=( -2001 + 2001 ) + 1999
= 0 + 1999
= 1999
c, 43 - 863 - ( -137 - 57 )
= 43 - 863 + 137 + 57 ( do phá ngoặc đổi dấu )
= ( 43 + 57 ) + ( - 863 + 137 )
= 100 + ( - 726 )
= - 626
Kết quả đúng rùi đó.Máy tính cũng bằng vậy mà.
Thuc hien phep tinh sau bang cach hop li nhat:
a)5/11+1/2+2/5+6/11+3/4+16/25+5/16
b)19/4+37/100+1/8+132/25+5/2+37/12
5/11+1/2+2/5+6/11+3/4+16/25+5/16
=1441/400
19/4+37/100+1/8+132/25+5/2+37/12
=1933/120
Ban lam sao duooc nhu the giai ra cho minh voi
tinh nhanh
a,(-137)+(+52).(-137)+(-137).(+47)
b,-135+135.(-19)-80.135
a,( -137 ) + (+52) . (-137) + (-137) . (+47)
<=> ( - 137 ) . 1 + 52 . ( - 137 ) + ( - 137 ) . 47
<=> ( - 137 ) . ( 1 + 52 + 47 )
<=> -137 . 100
<=> - 13700
b,-135 + 135 . ( -19 ) - 80 . 135
<=>-135 + 135 . ( -19 ) + ( -80 ) . 135
<=>-135 . 1 + 135 . ( -19 ) + ( -80 ) . 135
<=>-135 .[ ( -19 ) + ( - 80 ) + 1 ]
<=>-135.(-100)
<=>-13500
giúp mình bài này nha
-16:(-8)+5[3-15:5+2(-3+4)]
15*(-236)+15*235
237*(-28)+28*137
(-3)*(-17)+3*(120-17)
(-8)*72+8*(-19)-(-8)
`#3107.101107`
\(-16 \div (-8)+5[3-15\div5+2(-3+4)]\)
`= 2 + 5(3 - 3 - 6 + 8)`
`= 2 + 5*(-6 + 8)`
`= 2 + 5*2`
`= 2(5 + 1)`
`= 2*6 = 12`
____
`15*(-236)+15*235`
`= 15 * (-236 + 235)`
`= 15 * (-1)`
`= -15`
____
`237*(-28)+28*137`
`= 28 * (-237 + 137)`
`= 28 * (-100)`
`= -2800`
____
`(-3)*(-17)+3*(120-17)`
`= 3 * 17 + 3 * (120 - 17)`
`= 3 * (17 + 120 - 17)`
`= 3 * 120`
`= 360`
____
`(-8)*72+8*(-19)-(-8)`
`= 8 * (-72) + 8 * (-19) + 8`
`= 8 * (-72 - 19 + 1)`
`= 8 * (-90)`
`= -720`
a)−16÷(−8)+5[3−15÷5+2(−3+4)]
=2+5(3−3−6+8)
=2+5⋅(−6+8)
=2+5⋅2
=2(5+1)
=2⋅6
=12
b)15⋅(−236)+15⋅235
=15⋅(−236+235)
=15⋅(−1)
=−15
c)237⋅(−28)+28⋅137
=28⋅(−237+137)
=28⋅(−100)
=−2800
d)(−3)⋅(−17)+3⋅(120−17)
=3⋅17+3⋅(120−17)
=3⋅(17+120−17)
=3⋅120
=360
e)(−8)⋅72+8⋅(−19)−(−8)
=8⋅(−72)+8⋅(−19)+8
=8⋅(−72−19+1)
=8⋅(−90)
=−720
1.tinh hop li
a.2/13/19+8/21-13/19+3,5+13/21
b.11/25.(-24.8)-11/25.75.2
a: \(=2+\dfrac{13}{19}+\dfrac{8}{21}-\dfrac{13}{19}+\dfrac{7}{2}+\dfrac{13}{21}\)
\(=2+\dfrac{7}{2}+1=3+\dfrac{7}{2}=\dfrac{13}{2}\)
b: \(=\dfrac{11}{25}\left(-192-150\right)=\dfrac{11}{25}\cdot\left(-342\right)=-\dfrac{3762}{25}\)
tinh nhanh
39.(19-13)-19.(39-13)
(42-69+17)-(42+17)
137.(-26)+26.137
-67.11
65.(-21)
-67x11=-67x(10+1)=-67x10+(-67)x1=-670+-67=-737
39.(19-13)-19.(39-13)
=39.19 - 39.13 - 19.39 - 19.13
=0
(42-69+17)-(42+17)
=42-69+17-42-17
=0-69+0
=-69
137.(-26)+26.137
=137[(-26)+26]
=137.0
=0
-67.11
=-67(10+1)
=-670+-67
=-737
65.(-21)
=65[-(10+10+1)]
=-650+-650+-65
=-1365
Tinh bang cach hop li neu co ( trinh bay )
A = - [ -506 + 732 - ( -2000 ) ] - ( 506-1732)
B = 1037+ {743-[1031-(+57)]}
C = ( 125*73-125*75) / (-25*2)
D = -25*(35+147)+35*(25+147)
E = 125*9*(-4)*(-8)*25*7
G = (-3) mũ 2 + (-5) mũ 3 / giá trị tuyệt đối của 5
A=-[-506+732-(-2000)]-(506-1732)
=-506-732+2000-506+1738
=(-506+506)+(1732-732)-2000
= 0 + 1000 -2000
= -1000
B=1037+{743-[1031-(+57)]}
=1037+{743-1031-57}
=1037+743-1031-57
=(1037-1031)+(743+57)
= 6 + 800
= 806
C=(125.73-125.75):(-25.2)
=[125.(73-75)]:(-50)
=[125.(-2)]:(-50)
= (-250) :(-50)
= 5
D=-25.(35+147)+35.(25+147)
=-25.35-25.147+35.25+35.147
=-25.147+35.147
=147.(-25+35)
=147.10
= 1470
E=125.9.(-4).(-8).25.7
=[125.(-8)].[(-4).25].9.7
=-1000.(-100).9.7
=-100000.9.7
=-9000000.7
=-63000000
G=(-3)2+(-5)3:|-5|
=9.(-125):5
=9-(-25)=-16
mk cũng làm giống ý kiến của bn Lê Phan Bảo Như.....^^
tinh bang cach thuan tien nhat a]765 cong 4327 cong 1235 b]291 cong 563 cong 309 cong 137
a, 765 + 4327 +1235
= 4327 + ( 765 + 1235 )
= 4327 + 2000 = 6327
b , 291 + 563 + 309 + 137
= ( 291 + 309 ) + ( 563 + 137 )
= 600 + 700 = 1300