Bài 2a, 3145 - 246 + 2347 - 145 + 4246 - 347
3145 - 246 + 2347 - 145 + 4246 - 347
3145 - 246 + 2347 - 145 + 4246 - 347
=9000
chúc hok tốt
3145 - 246 + 2347 - 145 + 4246 - 347
= (3145 - 145) + (4246 - 246) + (2347-347)
= 3000 + 4000 + 2000
= 9000
Tính nhanh:
3145 - 246 + 2347 - 145 + 4246 - 347
3145 - 246 + 2347 - 145 + 4246 - 347
= (3145 - 145) + (4246 - 246) + (2347 - 347)
= 3000 + 4000 + 2000
= 7000 + 2000
= 9000
3145 - 246 + 2347 - 145 + 4246 - 347
= (3145 - 145) + (2347 - 347) + (4246 - 246)
= 3000 + 2000 + 4000
= 5000 + 4000
= 9000
Tk cho mình nha ae!!!!!!!!!!!!!!! Ai tk mình thì mình tk lại.
Tính nhanh :
3145 - 246 + 2347 - 145 + 4246 - 347
= ( 3145 - 145 ) + ( 2347 - 347 ) + ( 4246 - 246 )
= 3000 + 2000 + 4000
= 5000 + 4000
= 9000
tính nhanh
349 + 602 + 651 + 398
3145 - 246 + 2347 - 145 + 4246 - 347
a)
349 + 602 + 651 + 398
= (349 + 651 ) + (602 + 398)
= 1000 + 1000
= 2000
b)
3145 - 246 + 2347 - 145 + 4246 - 347
= (3145 - 145) + (4246 - 246) + (2347 - 347)
= 3000 + 4000 + 2000
= 7000 + 2000
= 9000
\(349+602+651+398\)
\(=\left(349+651\right)+\left(602+398\right)\)
\(=1000+1000\)
\(=2000\)
_____
\(3145-246+2347-145+4246-347\)
\(=\left(3145-145\right)+\left(2347-247\right)+\left(4246-246\right)\)
\(=3000+2000+4000\)
\(=9000\)
\(349+602+651+398=\left(349+651\right)+\left(602+398\right)=1000+1000=2000\)\(3145-246+2347-145+4246-347=\left(3145-145\right)+\left(4246-246\right)+\left(2347-347\right)=3000+4000+2000=9000\)
câu 4:tính bằng cách thuận tiện
a.4276+2357+5724+7643
b.3145-246+2347-145+4246-347
c.(45-5x9)x2x3x4x5x6x7x8x9
a.(4276+5724)+(2357+7643)
=10000 + 10000
=20000
b.câu này không biết:)))
c.câu này cũng không biết :)))
a)4276+2357+5724+7643
= (4276+5724)+(2357+7643)
= 1000+1000
= 2000
b)3145-246+2347-145+4246-347
= (3145-145)+(4246-246)+(2347-347)
= 3000+4000+2000
= 9000
c)(45-5x9)x2x3x4x5x6x7x8x9
= (45-45)x2x3x4x5x6x7x8x9
=0x2x3x4x5x6x7x8x9
=0
c.(45-5x9)x2x3x4x5x6x7x8x9
=(45-45)x2x3x4x5x6x7x8x9
=0x2x3x4x5x6x7x8x9
=0
thui nha=)))
Tính hợp lý:
a) 815 - 23 - 77 + 185
b) 3145 - 246 + 2347 - 145 + 4246 - 347
c) 2018 : 1 - 2018 . 1 : 2018 . 2008 + 2018 . 2002
d) 9 - 8 - 7 - . . . - 2 - 1 . ( 500 . 9 - 250 . 18 )
Tính hợp lý:
a, 815 – 23 – 77 + 185
b, 3145 – 246 +2347 – 145 + 4246 – 347
c, (2018:1 – 2018.1):(2018.2008 + 2018.2002)
d, (9 – 8 – 7 – … – 2 – 1).(500.9 – 250.18)
a) 815 – 23 – 77 +185 = (815 + 185) – (23+77) = 1000 – 100 = 900
b) 3145 – 246 + 2347 – 145 + 4246 – 347
= (3145-145) + (4246 – 246) + (2347 – 347)
= 3000 + 4000 + 2000 = 9000
c) (2018:1 – 2018.1):(2018.2008+2018.2002) = 0 : (2018.2008+2018.2002) = 0
d) (9 – 8 – 7 – 6 – … – 2 – 1).(500.9 – 250.18)
= (9 – 8 – 7 – 6 – … – 2 – 1).(500.9 – 250.2.9)
= (9 – 8 – 7 – 6 – … – 2 – 1).(500.9 – 500.9)
= (9 – 8 – 7 – 6 – … – 2 – 1).0 = 0
\(3145-246+2347-145+4246-347\)
Tính nhanh nha các bạn Đây là bài tính nhanh...
Dễ mà ai nhanh mk tk
=(3145-145)+(4246-246)+(2347-347)
=3000 +4000 +2000
= 9000
3145−246 + 2347−145 + 4246−347
= ( 3145 - 145 ) + ( 4246 - 246 ) + ( 2347 - 347 )
= 3000 + 4000 + 2000
= 7000+ 2000 = 9000
(3145-145) + (4246- 246) + (2347 - 347)
= 3000 + 4000+ 2000
= 9000
b: =2376-376+3425-42
=2000+3383
=5383
c: =3145-145+246+4246+2347-347
=3000+2000+4492
=9492
e: =(72-72):A=0
tính nhanh
3145 - 246 + 2347 - 145 + 4246 - 347
81,3x99 + 82 -0,7
124 x 76 +12 x 248
128 x 68 + 16 x 256
17,8 x 99 +17 + 0,8
3145-246+2347-145+4246-347
=(3145-145)+(2347-347)+(4246-246)
=3000+2000+4000=9000
minh chi lam dk câu ý thui