\(x+90=-52\)
-x+12+52-90=12+52
-x+12+52-90=12+52
-x+(-26)=64
-x=64-(-26)
-x=90
x=90
Chúc bạn học tốt nha
10 + 90 + x = 52 + 8
\(10+90x=52+8\)
\(100+x=60\)
\(x=60-100\)
\(x=40\)
kmk3cainhaTomori NaoTheo đề ta có:
10 + 90 + x = 52 + 8
100 + x = 60
x = 60 - 100
x = -40
=> 10 + 90 + x =60
=>x=60-10-90
x=50-90
x=-40
k mình nha
(45 x 46 - 47 x x48) x (51 x 52 -49 x 48) x (45 x 128 - 90 x 64)
X
X
ẽ
fxe
xx
T
ct
E
D
F
D
Đ
d
F
f
f
F
f
F
F
f
F
F
F
a) x + 22 + (-14) + 52
b) (-90) - ( p + 10 ) + 100
a)x+22+(-14)+52=x+8+52=x+60
b)-90-(p+10)+100=-90-p-10+100=-p+0=-p
a)=x+22-14+52 b)=(-90)-p-10+100
=x+22+52-14 =(-90)-10-p+100
=x+74-14 =(-100)-p+100
=x+60 =(-100)+100-p
=0-p=-p
a) x + 22 + (-14) + 52 = x + [ 22 + 52 ] + (-14) = x + 74 + (-14)
= x + [ 74 + (-14) ] = x + 60
b) (-90) - (p + 10) + 100 = (-90) - p - 10 + 100 = - p - 90 - 10 + 100
= -p - (90 + 10) + 100 = -p - 100 + 100 = -p + [ (-100) + 100] = -p
Tích sau có tận cùng bao nhiêu chữ số 0 ?
T = 51 x 52 x ... x 89 x 90
( 45 x 46 + 47 x 48)x (51 x 52 -49x 48) x ( 45 x 128- 90 x 64)x (1995 x 1996 +1997 x 1998)
\(\left(45\cdot46+47\cdot48\right)\cdot\left(51\cdot52-49\cdot48\right)\cdot\left(45\cdot128-90\cdot64\right)\cdot\left(1995\cdot1996+1997\cdot1998\right)\)
\(=\left(45\cdot46+47\cdot48\right)\cdot\left(51\cdot52-49\cdot48\right)\cdot\left(45\cdot2\cdot64-90\cdot64\right)\cdot\left(1995\cdot1996+1997\cdot1998\right)\)
\(=\left(45\cdot46+47\cdot48\right)\cdot\left(51\cdot52-49\cdot48\right)\cdot\left(90\cdot64-90\cdot64\right)\cdot\left(1995\cdot1996+1997\cdot1998\right)\)
\(=\left(45\cdot46+47\cdot48\right)\cdot\left(51\cdot52-49\cdot48\right)\cdot0\cdot\left(1995\cdot1996+1997\cdot1998\right)\)
\(=0\)
(45 x 46 + 47 x 48) x (51 x 52 - 49 x 48) x (45 x 128 - 90 x 64) x (1995 x 1996 + 1997 x 1998)
= A x B x (45 x 128 - 45 x 2 x 64) x C
= A x B x (45 x 128 - 45 x 128) x C
=A x B x 0 x C
=0
Đơn giản biểu thức:
X + 22 + (-14) + 52
(-90) - (p + 10 ) + 100
\(x+22+\left(-14\right)+52=x+60\)
\(\left(-90\right)-\left(p+10\right)+100=-90-p-10+100=-p\)
tính bằng cách nhanh nhất : ( 51 x 52 - 49 x 48 ) x ( 45 x 128 ) x ( 45 x128 - 90 x 64) x ( 1995 x 1996 x 1997)=
( 51 x 52 - 49 x 48 ) x ( 45 x 128 ) x ( 45 x128 - 90 x 64) x ( 1995 x 1996 x 1997)
= ( 51 x 52 - 49 x 48 ) x ( 45 x 128 ) x ( 5760 - 5760 ) x ( 1995 x 1996 x 1997)
= ( 51 x 52 - 49 x 48 ) x ( 45 x 128 ) x 0 x ( 1995 x 1996 x 1997)
= 0.
#Y/n