x+63=123+12
63-[(12-123)3:4].27
(-33)+(-66)
giúp mình với.
a: \(=63-\left[\left(-111\right)^3:4\right]\cdot27=9231572,25\)
b: =-(33+66)=-99
Làm bài tập về nhà:
1.Tính nhanh
A, 72 + 137 + 28
B, 347 + 418 + 123 + 12
C, 38 x 63 + 37 x 38
D, 1 + 2 + 3 + …. + 20
a ) 72 + 137 + 28
= ( 72 + 28 ) + 137
= 100 + 137 = 237
b ) 347 + 418 + 123 + 12
= ( 347 + 123 ) + ( 428 + 12 )
= 470 + 440
= 910
c ) 38 x 63 + 37 x 38
= 38 x ( 63 + 37 )
= 38 x 100
= 3800
d) 1 + 2 + 3 + ... + 20
= ( 20 + 1 ) + ( 19 + 2 ) + ... + ( 11 + 10
= 21 x 10
=210
a) 72+137+28
=(72+28)+137
= 100 + 137
= 237
b) 347+418+123 + 12
= ( 347+123) + (418+12)
= 370 + 430
= 800
c) 38 x 63 + 37 x 38
= 38 x ( 63+37)
= 38 x 100
= 3800
d) 1+2+3+...+20
= ( 1+20) x 20 : 2
= ( 1+20) x ( 20 :2)
= (1+20) x 10
= 21 x 10
= 210
a, 72 + 137 + 28
= ( 72 + 28 ) + 137
= 100 + 137
= 237
b, 347 + 418 + 123 + 12
= ( 347 + 123 ) + ( 418 + 12 )
= 470 + 430
= 900
c, 38 x 63 + 37 x 38
= 38 x ( 63 + 37 )
= 38 x 100
= 3800
d, 1 + 2 + 3 + .... + 20
= ( 20 + 1 ) x ( 20 : 2 )
= 21 x 10
= 210
TTìm số nguyên x, biết: a) 262 + ( 2x - 123)= 283; b) 63 - ( - 51 + 3x) = 237 c) - ( 2x + 24) + 211 = -123 d) 125 - ( 125 - x) + 22+ 3x) = 237 c) - ( 2x + 24) + 211 = -123 d) 125 - ( 125 - x) + 22
12 x X = 123 x 123 + 409
12 x X = 123 x 123 + 409
12 x X = 15129 + 409
12 x X = 15538
X = 15538 : 12
X = \(\dfrac{7769}{6}\)
\(12.X=123.123+409\)
\(12.X=15129+409\)
\(12.X=15538\)
\(X=15538:12\)
\(X=\dfrac{7769}{6}\)
Vậy \(X=\dfrac{7769}{6}\)
Ghi chú 12 . X = 12 x X
123 + 123 + 23 + 12 =?
12 x 4 =?
123 + 123 + 23 +12 = 281
12 x 4 =48
ai qua nhớ cho mk nha ^_-,cảm ơn cac bn nhìu
123+123+23+12=281
12x4=48 nha
o0o Phương Uyên o0otính bằng cách thuận tiên nhất a 36 x 532 63 x 532 532b 679 679 x 123 679 x 24c 245 x 327 245 x 18 9 x 245
12 ? 3 = 4 x 4 = ?
20 x 3 = ?
90 x 1 = ?
123 - 123 = ?
10 x 9 = ? / 9 = ?
12 - 9 = ? x 9 = ?
23 - 5 = ?
123 + 12 = ?
1000 - 200 = ?
333 - 111 = ?
12 : 3 = 4 x 4 = 16
20 x 3 = 60
90 : 1 = 90
123 - 123 = 0
10 x 9 = 90 : 9 = 10
12 - 9 = 3 x 9 = 27
23 - 5 = 18
123 + 12 = 135
1000 - 200 = 800
333 - 111 = 222
\(20.3=60\)
\(90.1=90\)
\(123-123=0\)
\(10.9=\frac{810}{9}=90\)
\(23-5=15\)
\(123+12=135\)
\(1000-200=800\)
\(333-111=222\)
a) -81 . 36 + (-81) . 63 - 81
b) 23 . (-38 + 123) - 123 . ( 23 -38)
TÍNH HỢP LÝ NẾU CÓ THỂ
a: \(-81\cdot36+\left(-81\right)\cdot63-81\)
\(=36\cdot\left(-81\right)+63\cdot\left(-81\right)+\left(-81\right)\)
\(=-81\left(36+63+1\right)\)
\(=-81\cdot100=-8100\)
b: \(23\cdot\left(-38+123\right)-123\cdot\left(23-38\right)\)
\(=-23\cdot38+23\cdot123-123\cdot23+123\cdot38\)
\(=123\cdot38-23\cdot38=38\left(123-23\right)=38\cdot100=3800\)
tìm x :
123-x=123.(12-1)
123-x=123.(12-1)
123-x=123.11
123-x=1353
x=1353:123
x=11
vậy x=11
Bài làm
123 - x = 123 . ( 12 - 1 )
123 - x = 123 . 11
123 - x = 1353
x = 123 - 1353
x = -1230
Vậy x = -1230
# Học tốt #
123 - x = 123 . (12 - 1)
123 - x = 123 . 11
123 - x = 1353
x = 1353 - 123
x = 1230