145 * 21
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D = (1-5-9+13)+(17-21-25+29)+....+(145-149-153+157)-157
= 0+0+....+0 - 157
= -157
k mk nha
D=(1-5-9+13)+(17-21-25+29)+...+(145-149-153+157)-157
=0+0+...+0-157
=-157
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21 765 - 4 x 25 + 75 = 21 765 - 100 + 75 = 21 740
125 x 4 - 25 + 3 619 = 125 x 3 598 = 449 750
145 - 45 : 9 + 32 = 145 - 5 + 32 = 172
145 x 78 + 22 x 145 + 145 = 145 x ( 78 + 22 ) + 145 = 145 x 100 + 145 = 14 500 +145 = 14 645
...
7x - 7 = 343 4 305 : 5x = 21
7x = 343 + 7 5x = 4 305 : 21
7x = 350 5x = 205
x = 350 : 7 x = 205 : 5
x = 50 x = 41
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a) (-234) + |-145| + (-2019) + |155| + (-66)
= -234 + 145 - 2019 + 155 - 66
= (-234 - 66) + (145 + 155) - 2019
= -300 + 300 - 2019
= 0 - 2019 = -2019
b) -79.|-45| - 21.|45|
= -79.45 - 21.45
= (-79 - 21) . 45
= -100 . 45
= -4500
a, (-234) + |-145| + (-2019) + |155| + (-66)
= -234 + 145 - 2019 + 155 - 66
= (-234 - 66) + (145 + 155) - 2019
= -300 + 300 - 2019
= 0 - 2019
= -2019
b, -79 . |-45| - 21 . |45|
= -79 . 45 - 21 . 45
= 45 . ( -79 - 21 )
= 45 . (-100)
= -4500
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a,(-8-12):/-5/=-20:5=4(ban oi con nay ko tinh nhanh dc)
b,(-49)-/-145/+(-2017)+/245/+(-51)=(-49+am 51)-145-2017+245=-100+100-2017=0-2017=-2017
c lam theo con gai obama minh ko chac ban tinh lai ket qua xem
d,-99(2-678)-678.99=-99.676+678.(-99)=-99.676+678.(-99)=-99(676+678)=-99.1345=-133155(tinh lai ket qua nha)
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a . 27 : { 480 : [ ( 513 : 32 + 19 ) + 22 . 21 ] }
= 27 : { 480 : [ 76 + 4 . 21 ] }
= 27 : { 480 : 160 }
= 27 : 3
= 9
b . ( -1907 ) + ( 1907 - 605 )
= ( -1907 ) + 1302
= -605
c . - ( 76 + 159 ) + ( 159 + 176 - 48 )
= ( - 235 ) + 287
= 52
d . ( 3096 -145 ) - ( 3096 -445 )
= 2951 - 2651
= 300
câu cuối mik ko chắc nhé bạn
k đúng cho mik na! :3
a ) 27 : { 480 : [ ( 513 : 32 + 19 ) + 22. 21]}
= 27 : { 480 : [ ( 513 : 9 + 19 ) + 4 . 21] }
= 27 : { 480 : [ 76 + 84 ] }
= 27 : { 480 : 160 }
= 27 : 3
= 9
b) ( -1907) + ( 1907 - 605)
= [ ( -1907) + 1907 ] - 605
= 0 - 605
= - 605
c) -( 76+ 159 ) + ( 159 + 176 - 48 )
= -235 + 287
=52
d) ( 3096 - 145 ) - ( 3096 - 445)
= 3096 - ( 445 - 145 )
= 3096 - 300
=2796
tk nha bn
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b: =2376-376+3425-42
=2000+3383
=5383
c: =3145-145+246+4246+2347-347
=3000+2000+4492
=9492
e: =(72-72):A=0
145*213045 nha
145 * 21 = 3045