Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
14,65*73+14,65*28-14,65
=14,65*73+14,65*28-14,65*1
=14,65*(73+28-1)
=14,65*100
=1465
14,65*73+14,65*28-14,65 = 14,65(73+28-1)
=14,65*100
=1465
a) \(\left(145\times99+145\right)-\left(143\times102-143\right)\)
\(=\left[145\times\left(99+1\right)\right]-\left[143\times\left(102-1\right)\right]\)
\(=\left(145\times100\right)-\left(143\times101\right)\)
\(=14500-14443\)
\(=57\)
b) \(54\times47-47\times53-20-27\)
\(=47\times\left(54-53\right)-20-27\)
\(=47-20-27\)
\(=0\)
c) \(10000-47\times72-47\times28\)
\(=10000-47\times\left(72+28\right)\)
\(=10000-47\times100\)
\(=10000-4700\)
\(=5300\)
d) \(3457-27\times48-48\times73+6543\)
\(=\left(3457+6543\right)-48\times\left(27+73\right)\)
\(=10000-48\times100\)
\(=10000-4800\)
\(=5200\)
Tính thuận tiện :
Bài làm:
59534 + 61755 + 40466 + 138245 + 73928 + 226072 + 246238
=(59534 + 40466) + (61755 + 138245) + (73928 + 226072) + 246238
=100000 + 200000 + 300000 + 246238
=600000 + 246238
=846 238.
73.44756 + 73.55245 - 73
=73.(100000) - 73
=7 300 000 - 73
=7 299 927
A) 59534 + 61755 + 40466 + 138245 + 73928 + 226072 + 246438
= (59534 + 40466) + (61755 + 138245) + (73928 + 226072) + 246438
= 100000 + 200000 + 300000 + 246438
= 300000 + 300000 + 246438
= 600000 + 246438
= 846438
a,71-(33+x)=26
33+x =71-26
33+x =45
x =45-33
x =12
b,(x+73)-26=76
x+73 =76+26
x+73 =102
x =102-73
x =29
Bài :Tìm x:
a)71-(33+x)=26
(33+x)=71-26
(33+x)=45
x =45-33
x =12
b)(x+73)-26=76
x+73 =76+26
x+73 =102
x =102-73
x =29
k cho mk nha
g) x - [ 42 + (-28)] = -8
\(\Rightarrow x-\left(42-28\right)=-8\)
\(\Rightarrow x-14=-8\)
\(\Rightarrow x=-8+14\)
\(\Rightarrow x=6\)
e) | x - 3| = |5| + | -7|
\(\Rightarrow\left|x-3\right|=5+7\)
\(\Rightarrow\left|x-3\right|=12\)
\(\Rightarrow\orbr{\begin{cases}x-3=12\\x-3=-12\end{cases}}\)
\(\Rightarrow\orbr{\begin{cases}x=15\\x=-9\end{cases}}\)
3,54 x 73 + 0,23 x 25 + 3,54 x 27 + 0,17 x 25
= 3,54 x ( 73 + 27 ) + 25 x ( 0,23 + 0,17 )
= 3,54 x 100 + 25 x 0,4
= 354 + 10
= 364
\(\text{3,54 x 73 + 0,23 x 25 + 3,54 x 27 + 0,17 x 25}\)
\(\text{= 3,54 x ( 73 + 27 ) + 25 x ( 0,23 + 0,17 )}\)
\(\text{= 3,54 x 100 + 25 x 0,4}\)
\(\text{= 354 + 10}\)
\(\text{= 364}\)
a) 10000 - 47 . 72 - 47 . 28
= 10000 - 47 ( 72 - 28 )
= 10000 - 47 . 44
= 10000 - 2068
= 7932
b) 3457 - 27 . 48 - 48 . 73 + 6543
= 3457 - 48 ( - 27 - 48 ) + 6543
= 3457 - 48 . ( - 75 ) + 6543
= 3457 - ( - 27 ) + 6543
= 3457 + 27 + 6543
= 10027
a, 10000-47×72-47×28
= 10000-47(72+28)
=10000-47×100
=10000-4700= 5300
https://olm.vn/hoi-dap/question/783933.html