tinh nhan 66 +45 +45 + 35
A)638*78+45 -66 ÷35 =??
638 x 78 + 45 - 66 : 35
= 49807,11429
Đ/S: 49807,11428
knha
Tính nhanh
a; ( 191×5 - 109 ×5) + ( 624:4-296:4)
b; ( 45 + 75) × 66 +(75+45)×35
mik chỉ nêu cách lm
a) ((5*(191-109)))+((624-296)/4))
b)100*66+100*35
=100*(66+35)=
( 191 x 5 - 109 x 5 ) + ( 624 : 4 - 296 : 4 )
= [ ( 191 - 109 ) x 5 ] + [ ( 624 - 296 ) : 4 ]
= 82 x 5 + 82
= 82 x ( 5 + 1 )
= 82 x 6
= 492
( 45 + 75 ) x 66 + ( 75 + 45 ) x 35
= ( 45 + 75 ) x ( 66 + 35 )
= 120 x 101
= 12120
hok tốt
1,Tinh hop li
a, (-234)+/-145/+(-2019)+/155/+(-66)
b, -79./-45/-21./45/
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
tinh hop li: 77-11(30+7)
85(35-27)-35(85-27)
47(45-15)-47(15+45)
???????????????????????????????????????????????????????????????????????
tinh bang hai cach
A)15 nhan 12-3nhan 5 nhan 10
B)45-9 nhan (13+5)
C)29 nhan (19-13)-19 nhan (29-13)
25 nhân 4 + 75 nhân + 7 nhan 25 / 5 - 10 + 15 - 20 + 25 - 30 + 35 - 40 + 45
25x4+75x+7x25/5-10+15-20+25-30+35-40+45=2720
a, 35. 34+ 35. 36+ 66. 75+ 66. 45
b, 3. 25. 8+ 4. 37. 6+ 2. 38. 12
c, 36. 28+ 36. 82+ 64. 69+ 64. 41
d, 39. 8+ 60. 2+21.8
tinh cach thuan tien 45 - 5 nhan [12+9]
thanks nhung ban nao lam dc bai nay
này nhăn tin ko trả lời à 4 mắt
1 , tinh bang cach tien nhat
[500 cong 115 ] nhan 55 cong[ 600 cong 15 ] nhan 15 cong [ 700 - 85] nhan 85 cong [ 900 -285 ] nhan 45
giai tung buoc cho minh nha
(500+115)x55+(600+15)x15+(700-85)x85+(900-285)x45
=615x 55+615x15+615x85+615x45
=615 x (55+15+85+45)
= 615 x 200
=123000