Cau 1 : Tinh hop ly
a) (326-43) + (174-57)
b) (351-875) - (125-149)
c) -418-{-218-[-118-(-318)+2012)]}
d) (-2)+7+(-12)+17+...+(-52)+57
e) (-30)+(-29)+...+49+50
Mk se tick cho ai tra loi cho mk dau tien nko ghi cach lm nx nhe thank you cac bn
Bài 1: Tính hợp lý
a) (326 - 43) + ( 174 -57)
b)(351 - 875) - (125 - 149)
c) -418 - ( -218 - ( -118 - ( -318 + 2012))
d) (-2) + 7 + (-12) + 17 +... + (-52) + 57
e) (-30) + ( -29) + ... + 48 + 49 +50
a) (326 - 43) + (174 - 57)
= 326 - 43 + 174 - 57
= (326 + 174) - (43 + 57)
= 500 - 100
= 400
b) (351 - 875) - (125 - 149)
= 351 - 875 - 125 + 149
= (351 + 149) - (875 + 125)
= 500 - 1000
= -500
c) - 418 - (-218 - (-118 - (-318 + 2012)))
= -418 - (-218 -(-118 + 318 - 2012))
= -418 - (-218 + 118 - 318 + 2012)
= -418 + 218 - 118 + 318 - 2012
= -2012
d) (-2) + 7 + (-12) + 17 + ... + (-52) + 57
= 5 + 5 + ... + 5
= 5.12
= 60
e) (-30) + (-29) + ... + 48 + 49 + 50
= 31 + 32 + ... + 49 + 50 (20 số hạng)
= \(\dfrac{\left(31+50\right).20}{2}\)
= 810
Bài 1: Tính hợp lí:
a) (326 - 43) + ( 174 -57)
= 326 - 43 + 174 -57
= (326 + 174) - (43 + 57)
= 500 - 100
= 400
b) (351 - 875) - (125 - 149)
= 351 - 875 - 125 - 149
= (875 + 125) - (351 + 149)
= 1000 - 500
= 500
Tính cách hợp lí
d) 54+( -37+10-54+67)
e) ( 326-43)+( 174-57)
f) ( 351-875) - ( 125-149)
g) -418 -{ -218-[ -118-(-131)] +2017}
h) -2 +7 + -12+17+....+ -52 + 57
i) - 30+ -29 + ...+ 48+49+50
d. 54-54+67-37+10
=40
e. 326+174-43-57
=400
f. 351+149-875-125
=-500
Tính nhanh
a) (326-43)+(174-57)
b) (351-875)-(125-149)
c) -418-{-418-[-418-(-418+2016)]}
d) -1+2+3+...+99-100-101
Tính hợp lí: a) (-418)-{-218-[100-(318+2012)]}
b) (351-875)-(125-149)
Giúp mik với nha yêu mn
a,(-418)-{-218-[100-(318+2012)]}
=(-418)-{-218-[100-2330]}
=(-418)-{-218-(-2230)
=(-418)-{-218+2230}
=(-418)-2012
= -2430
b,(351-875)-(125-149)
=(-424)-(-24)
=(-424)+24
= -400
a)(-418)-{-218-[100-(318+2012)]}
= -418+218-100+318+2012
=(-418-100)+(218+2012)+318
= -318+2230+318
=[(-318)+318)+2210
=0+2230
=2230
b) (351-875)-(125-149)
=351-875-125+149
=(351+149)-(875+125)
=500-1000
=-500
học tốt nhé
a,=-418-{-218-[100-318-2012]}
=418-{-218-100+318+2012}
=418+218+100-318-2012
=(418-318)+(100+218+2012)
=100+2330
=2430
b,(351-875)-(125-149)
=351-875-125+149
=(351+149)-(875+125)
=500-1000
=-500
bt1: tính nhanh
a) - 287+ 499+ (- 499)+ 285
b) ( 326- 43) + ( 174- 57)
c) ( 351- 875) - ( 125 - 149)
d) (-8) . 25 .(-2) .4 (-5) .125
e) (-167). 83+ 167. (-17) -33
g) (- 284). 172+ (-284). (-72)
a) - 287+ 499+ (- 499)+ 285
= ( - 287 + 285 ) + [ 499 + ( - 499 ) ]
= -2 + 0 = -2
b) ( 326- 43) + ( 174- 57)
= 326 - 43 + 174 - 57
= ( 326 + 174 ) - ( 43 + 57 )
= 500 - 100
= 400
c) ( 351- 875) - ( 125 - 149)
= 351 - 875 - 125 + 149
= ( 351 + 149 ) - ( 875 + 125)
= 500 - 1000
= - 500
d) (-8) . 25 .(-2) .4 (-5) .125
= [ ( - 8 ) . 125 ] . (25 . 4) . [( - 2) . ( - 5)
= 1000 .100 . 10
= 1000000
e) (-167). 83+ 167. (-17) -33
= 167 . [ ( - 83 ) + ( - 17) ] - 33
= 167 . ( - 100) -33
= - 16700 -33
= - 16733
g) (- 284). 172+ (-284). (-72)
= ( - 284 ) . ( 172 - 72)
= - 284 . 100
= - 28400
~ Học tốt
# Chiyuki Fujito
1, Tính nanh bằng cách hợp lý :
a) 215+(-38)-(-58)+90-85
b) 917 - ( 417 -65)
c) 31-[ 26-(2017+38)]
d) 54 + (-37+10-54+67)
e) (326-43) + ( 174 -57)
g) -418-{-218-[-118-(-131)]+2017}
CJIEEUF MK PHẢI NỘP GẤP GIÚP MK NHÉ ! MK SẼ TICK
a)215+((-38)-(-58))+(90-85)
215+20+5
(215+5)+20
220+20
240
a: =215-85-38+58+90
=130+90+20
=150+90=240
b: \(=917-417+65=500+65=565\)
c: \(=31-26+2017+38=2060\)
d: \(=54-37+10-54+67=10+30=40\)
e: \(=326-43+174-57=500-100=400\)
a. ( -37 ) + ( - 112 )
b. ( -42 ) + 52
c. 13 -31
d. 14 -24 -12
e. ( -25 ) + 30 -15
cac ban lam dau du ghi cau tra loi nha
minh se tick cho
\(a.\left(-37\right)+\left(-112\right)=-149\)
\(b.\left(-42\right)+52=10\)
\(c.13-31=-18\)
\(d.14-24-12=-22\)
\(e.\left(-25\right)+30-15=-10\)
a, (-37) + (-112) = -149
b, (-42) + 52 = 10
c, 13 - 31 = -18
d, 14 - 24 - 12 = -22
e, (-25) + 30 - 15 = -10
TÍNH GIÁ TRỊ CỦA BIỂU THỨC :
a) A=(-123)+77+(-257)+23-43
b) B=48+|48-174|+(-74)
c) C=-2012-(-596)+(-201)+496+301
d) D=1+2-3-4+5+6-7-8+...-79-80-81
e) E=-418-{-218-[-118-(-318)+2012]}
f) F=1-2+3+4+...+99-100
g) G=1-2-3+4+5-6-7+...+97-98-99+100
GIÚP MIK VỚI CẢM ƠN !
a)A=(-123) - 77 + (-257) +23 - 43 b)B=48+| 48-174|+(-74)
A=[(-123) - 77]+[(-257)-43]+23 B=48+(174-48)+(-74)
A= -200+(-300)+23 B=48+174+(-48)+(-74)
A= -500+23 B=[48+(-48)]+[174+(-74)]
A= -477 B=0+100=100
c)C= -2012+(-596)+(-201)+496+301 d)D=1+2-3-4+5+6-7-8+............-79-80-81
C= -2012+[(-596)+496]+[(-201)+301] D=1+(2-3-4+5)+(6-7-8+9)+............+(78-79-80-81)
C= -2010+(-100)+100 D=1+0+0+............+(-162)
C= -2010+0 D=1+(-162)
C= -2010 D= -161
nguoi dau tien gui cau tra loi va ket ban voi minh,minh se tick cho nguoi do