Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
Tính bằng 2 cách :
a). 234 x 25 + 234 x 75
C1: \(234\times25+234\times75\)
\(=5850+17550\)
\(=23400\)
C2: \(234\times25+234\times75\)
\(=234\times\left(25+75\right)\)
\(=234\times100\)
\(=23400\)
b). 765 x 123 - 755 x 23
C1: \(765\times123-765\times23\)
\(=94095-17595\)
\(=76500\)
C2: \(765\times123-765\times23\)
\(=765\times\left(123-23\right)\)
\(=765\times100\)
\(=76500\)
=> Bạn xem lại đề ạ!
c). 476 x ( 45 + 55 )
C1: \(476\times\left(45+55\right)\)
\(=476\times100\)
\(=47600\)
C2: \(476\times\left(45+55\right)\)
\(=476\times45+476\times55\)
\(=21420+26180\)
\(=47600\)
d). 2415 : 5 : 5
=> Xem lại đề ạ
e). ( 76 x 28 ) : 7
C1: \(\left(76\times28\right)\div7\)
\(=2128\div7\)
\(=304\)
C2: \(\left(76\times28\right)\div7\)
\(=76\times\left(28\div7\right)\)
\(=76\times4\)
\(=304\)
g). ( 175 + 29070 ) : 5
C1: \(\left(175+29070\right)\div5\)
\(=29245\div5\)
\(=5849\)
C2: \(\left(175+29070\right)\div5\)
\(=175\div5+29070\div5\)
\(=35+5814\)
\(=5849\)
h). ( 3224 - 1236 ) : 4
C1: \(\left(3224-1236\right)\div4\)
\(=1988\div4\)
\(=497\)
C2: \(\left(3224-1236\right)\div4\)
\(=3224\div4-1236\div4\)
\(=806-309\)
\(=497\)
1. ( 76 x 28 ) : 7 = 2128 : 7 = 304
2. 76 x (28 : 7) = 76 x 4 = 304
1/ (76 x 28) : 7
= 2128 : 7
= 304
2/ (76 x 28) : 7
= 76 x ( 28 : 7)
= 76 x 4
= 304
Hok tốt
`@` `\text {Ans}`
`\downarrow`
`A)`
`37 \times 46+37 \times 51+111`
`= 37 \times (46+51)+111`
`= 37 \times 97+111`
`= 3589 +111`
`= 3700`
`B)`
`35 \times 215-35 \times 210-175`
`= 35 \times (215-210)-175`
`= 35 \times 5-175`
`= 175-175=0`
`E)`
`76 \times 102-76 \times 2`
`= 76 \times (102-2)`
`= 76 \times 100`
`= 7600`
`C)`
`85 \times 94+85 \times 2 +170 \times 2`
`= 85 \times (94+2) + 170 \times 2`
`= 85 \times 96+170 \times 2`
`= 8160+340`
`= 8500`
`48 \times 56+28 \times 104`
`= 48 \times 28 \times 2+28 \times 104`
`= 28 \times (48 \times 2+104)`
`= 28 \times (96+104)`
`= 28 \times 200`
`= 5600`
`G)`
`206 \times 12-206-206`
`= 206 \times (12-1-1)`
`= 206 \times 10`
`= 2060`
a) 37 x 46 + 37 x 51 + 111
= 37 x ( 46 + 51 ) + 111
= 37 x 97 + 111
= 3589 + 111
= 3700
b) 35 x 215 - 35 x 210 - 175
= 35 x ( 215 - 210 ) - 175
= 35 x 5 - 175
= 175 - 175
= 0
e) 76 x 102 - 76 x 2
= 76 x ( 102 - 2 )
= 76 x 100
= 7600
c) 85 x 94 + 95 x 2 + 170 x 2
= 7990 + 2 x ( 95 + 170 )
= 7990 + 2 x 265
= 7990 + 530
= 8520
48 x 56 + 28 x 104
= 2688 + 2912
= 5600
g) 206 x 12 - 206 - 206
= 2472 - 206 - 206
= 2266 - 206
= 2060
a) 2 x 76 x 500 = (2 x 500) x 76
= 1 000 x 76
= 76 000
b) 5 x 300 x 800 = (5 x 800) x 300
= 4 000 x 300
= 1 200 000
c) 70 x 21 + 30 x 21 = 21 x (70 + 30)
= 21 x 100
= 2 100
d) 81 x 28 – 81 x 18 = 81 x (28 – 18)
= 81 x 10 = 810
Bài làm
Bài 1 : Tính nhanh
a) 10000 - 47x 7 -47 x 28
= 47x(10000-28)
=47x9972
=468684
b) 54x 47 - 53x 47 - 47
=47x(54-53)-47
=47x1-47
=47-47
=0
c)175 x 1274 - 175 x 273 - 175
=175x(1274-273)-175
=175x1001-175
=175175-175
=175000
# Chúc bạn học tốt #
1. a) 76 x 34 + 86 x 34
= 34 x ( 76 + 86 )
= 34 x 162
= 5508
b) 1 x 3 + 1 x 4 + 1 x 7 + 1
= 1 x 3 + 1 x 4 + 1 x 7 + 1 x 1
= 1 x ( 3 + 4 + 7 + 1 )
= 1 x 15
= 15
a) 216 x 5 x 2
= 216 x (5x2)
= 216 x 10 = 2160
b) 4 x 76 x 25
= (4 x 25) x 76
= 100 x 76 = 7600
c) 5 x 19 x 2
= ( 5 x2 ) x 19
= 10 x 19 = 190
d) 125 x 23 x 8
= ( 125 x 8) x 23
= 1000 x 23 = 23000
a) ( 76 x 28 ) : 7 = 2128 : 7
= 304
Cách 2 : ( 76 x 28 ) : 7 = 76 x ( 28 : 7 )
= 76 x 4
= 304
b) ( 175 + 29 070 ) : 5 = 29 245 : 5 = 5849
Cách 2 : ( 175 + 29 070 ) : 5 = 175 + ( 29 070 : 5 )
= 175 + 5814
= 5849
c )
( 3224 - 1236 ) : 4
C1: (3224 − 1236) : 4( 3224 −1236 ) : 4
=1988 : 4 = 1988 : 4
=497
C2: ( 3224 − 1236 ) : 4 = 3224 : 4− 1236 : 4
= 806 − 309
=497
~ Học tốt ~