Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
a) \(\text{13 x 58 x 4 + 32 x 26 x 2 + 52 x 10 }\)
\(\text{=(13 x 4 ) x 58 + 32 x 13 x 2 x 2 + 13 x 4 x 10}\)
\(\text{= ( 13 x 4 ) x 58 + 32 x ( 13 x 2 x 2 ) + ( 13 x 4 ) x 10 }\)
\(\text{= 52 x 58 + 32 x 52 + 52 x 10}\)
\(\text{=52 x ( 58 + 32 + 10 )}\)
\(\text{=52 x 100 = 5200}\)
b) \(\text{14 x 35 x 5 + 10 x 25 x 7 + 20 x 70 x 2}\)
\(\text{= ( 14 x 5 ) x 35 + (10 x 7 ) x 25 + 20 x 70 x 2 }\)
\(\text{= 70 x 35 + 70 x 25 + 20 x 2 x 70 }\)
\(\text{= 70 x ( 35 + 25 + 40 )}\)
\(\text{= 70 x 100 = 7000 }\)
e) \(\text{5.3.37.4+5.24.21+21.5.12}\)
\(\text{= 5.(3.37.4+24.21+21.12)}\)
\(\text{= 5.1200}\)
\(=6000\)
13.58.4 + 32.26.2 + 52.10
= 52.58 + 32.52 + 52.10
= 52.(58+32+10)
= 52.100
=5200
b) 15.37.4 + 120.21 + 21.2.12
= 3.4.5.37 + 12.10.21 + 21.2.12
= 12.185 + 12.210 + 12.42
= 12 ( 185+210+42)
= 12.437
= 5244
c) 25.4 + 10.225 + 6.50
= 100 + 10.225 + 300
= 10.10+10.225+10.30
= 10(10+225+30)
= 10.265
= 2650
rùi giải tiếp
bài 1 :
A> 13 x 58 x 4 + 32 x 26 x 2 + 52 x 10 ( thay dầu . = x )
=(13 x 4 ) x 58 + 32 x 13 x 2 x 2 + 13 x 4 x 10
= ( 13 x 4 ) x 58 + 32 x ( 13 x 2 x 2 ) + ( 13 x 4 ) x 10
= 52 x 58 + 32 x 52 + 52 x 10
=52 x ( 58 + 32 + 10 )
=52 x 100 = 5200
B>15 x 37 x 4 + 120 x 21 + 21 x 5 x 12
= ( 15 x 4 ) x 37 + 60 x 2 x 21 + 21 x (5 x 12 )
= 60 x 37 + 60 x 42 + 21 x 60
= 60 x ( 37 + 42 + 21 )
= 60 x 100 = 6000
C> 14 x 35 x 5 + 10 x 25 x 7 + 20 x 70 x 2
= ( 14 x 5 ) x 35 + (10 x 7 ) x 25 + 20 x 70 x 2
= 70 x 35 + 70 x 25 + 20 x 2 x 70
= 70 x ( 35 + 25 + 40 )
= 70 x 100 = 7000
{ câu 3/ hình như thiếu }
5.3.37.4+5.24.21+21.5.12
= 5.(3.37.4+24.21+21.12)
= 5.1200
= 6000
= ( 37 - 15 ) .4 ( vì ở phép nào cũng có số 21 ) + 120 .21 + 21 . 5 . 12
= 21 . 4 + 120 . 21 + 21 . 5.12
= 21 . ( 4 + 120 + 12 )
= 21. 136
= 2 856
mk nghĩ thế
15.37.4 + 120.21 + 21.5.12 = 15.4.37 + 21.2.60 + 5.12.21 = 60.37 + 42.60 + 60.21 = 60.(37 + 42 + 21) = 60.100 = 6000
`15*37*4+120*21+21*5*12`
`=60*37+60*2*21+60*21`
`=60(37+42+21)`
`=60*100`
`=6000`
1365 x 89 - 89 x 365 = 89 x (1365 - 365) = 89 x 1000 = 89000
13 x 58 x 4 + 32 x 26 x 2 + 52 x 10 = 52 x 58 + 32 x 52 + 52 x 10 = 52 x (58 + 32+ 10) = 52 x 100 = 5200
15 x 37 x 4 + 120 x 21 + 21 x 5 x 12 = 60 x 37 + 60 x 2 x 21 + 21 x 60 = 60 x (37 + 2 x 21 + 21) = 60 x 100 =6000
a) 29.64 - 29.24 + 40.81 =
29.(64 - 24) + 40.81 =
29.40 + 40.81 =
40.(29 + 81) =
40.110 = 4400
b) 14.35.5 + 10.25.7 + 20.70 =
70.35 + 70.25 + 20.70 =
70.(35 + 25 + 20) =
70.80 = 5600
c) 48.25 + 48.35 + 48.12 + 52.72 =
48.(25 + 35 + 12) + 52.72 =
48.72 + 52.72 =
72. (48 + 52) =
72.100 = 7200
d) 15.37.4 + 120.21 + 21.5.12 =
60.37 + 60.2.21 + 21.60 =
60.(37 + 42 + 21) =
60.100 = 6000