a.(82-41x2):36x(32+17+99-81+1)
[82-41*2]/36*[32+17+99-81+1]
\(\left(82-41\cdot2\right):36\cdot\left(32+17+99-81+1\right)\)
\(=\left(82-82\right):36\cdot\left[\left(32+17+1\right)+99-81\right]\)
\(=0:36\cdot\left[\left(32+17+1\right)+99-81\right]\)
\(=0\cdot\left[\left(32+17+1\right)+99-81\right]\)
\(=0\)
Học tốt !!!
( 82 - 41 x 2 ) : 36 x ( 32 + 17 + 99 - 81 + 1 )
các bạn trả lời giúp mk gấp nha mk cần lắm
=0 nha bn
tính nhanh
(82 - 41 x 2) : 36 x (32 +17 + 99 - 81 + 1)
(82-41.2):36.(32+17+99-81+1)
=0X(32+17+99-81+1)=0(tick nhe)
tinh nhanh
a, (82-41*2) chia 36 * (32+17+99-81+1)
b, (m chia 1- m* 1) chia (m* 2005 + m + 1)
a, ( 82 - 41 * 2 ) : 36 * ( 32 + 17 + 99 - 81 + 1 )
= ( 82 - 82 ) : 36 * ( 32 + 17 + 99 - 81 + 1 )
= 0 : ( ... )
= 0 .
b, ( m : 1 - m * 1 ) : ( m * 2005 + m + 1 )
= ( m - m ) : ( m* 2005 + m + 1 )
= 0 : ( ... )
= 0 .
`b. (4,5 × 16 - 1,7) : (4,5 × 14 + 2,8)`
`c. (82 - 41 × 2) ÷ 36 × (32 + 17 + 99 - 81 + 1)`
`d. (30 ÷ 7,5 + 0,5 × 3 - 1,5) × (4,5 - 9 ÷ 2 )`
b,
= (4,5 x16 - 1,7) : (4,5 x 15 - 1,7)
= 1
c,
= ( 82 - 82 ) : 36 x ( 32 + 17 + 99 - 81 + 1 )
= 0 : 36 x ( 32 + 17 + 99 - 81 + 1 )
= 0 x ( 32 + 17 + 99 - 81 + 1 )
= 0
d,
= (30 : 7,5 + 0,5 x 3 - 1,5) x (4,5 - 4,5)
= (30 : 7,5 + 0,5 x 3 - 1,5) x 0
= 0
Tính nhanh:
a. (82 - 41 x 2) : 36 x (32 +17 + 99 - 81 + 1)
b. (4,5 x 16 - 1,7) : (4,5 x 15 + 2,8)
b, ( 4,5 .x 16 - 1,7 ) : ( 4,5 x 15 + 2,8 - 4,5)
( 4,5 x16 - 1,7) : ( 4,5 x 15 - 1,7 ) = 1
giúp mình với , đang cần gấp !!!!!!!!!!!
b2
a) (38-60 ) + (20-38 )
b) 75-(20+75 )
c) 32+(60-32)
d) (81-36) - (81-36 )
e) (2+4+6+8) - (1+3+5+7)
f) (1+3+5+7+......+99) - (2+4+6+......+100)
chú ý : dạng quy tắc dấu ngoặc
a) (38 - 60) + (20 - 38)
= 38 - 60 + 20 - 38
= (38 - 38) + (-60 + 20)
= 0 - 40
= -40
b) 75 - (20 + 75)
= 75 - 20 - 75
= (75 - 75) - 20
= 0 - 20
= -20
c) 32 + (60 - 32)
= 32 + 60 - 32
= (32 - 32) + 60
= 0 + 60
= 60
d) (81 - 36) - (81 - 36)
= 81 - 36 - 81 + 36
= (81 - 81) + (-36 + 36)
= 0 + 0
= 0
e) (2 + 4 + 6 + 8) - (1 + 3 + 5 + 7)
= 2 + 4 + 6 + 8 - 1 - 3 - 5 - 7
= (2 - 1) + (4 - 3) + (6 - 5) + (8 - 7)
= 1 + 1 + 1 + 1
= 4
f) (1 + 3 + 5 + 7 + ... + 99) - (2 + 4 + 6 + 8 + ... + 100)
= 1 + 3 + 5 + 7 + ... + 99 - 2 - 4 - 6 - 8 - ... - 100
= (1 - 2) + (3 - 4) + (5 - 6) + (7 - 8) + ... + (99 - 100)
= -1 - 1 - 1 - 1 - ... - 1 (50 chữ số 1)
= -50
Tìm x:
a) \(\dfrac{-12}{17}\) < \(\dfrac{x}{17}\) < \(\dfrac{-8}{17}\)
b) \(\dfrac{-1}{2}< x< \dfrac{5}{3}\)
c) 3,456 < x \(\le\) 7,89
d) 5,82 < \(\overline{\text{5,8x0}}\) < 5,845
e) 32, 82 < \(\overline{\text{3x, 850}}\) < 35,845
a) \(\dfrac{-12}{17}< \dfrac{x}{17}< \dfrac{-8}{17}\)
\(\Rightarrow-12< x< -8\)
\(\Rightarrow x\in\left\{-11;-10;-9\right\}\)
b) \(\dfrac{-1}{2}< x< \dfrac{5}{3}\)
\(\Rightarrow\dfrac{-3}{6}< x< \dfrac{10}{6}\)
\(\Rightarrow x\in\left\{\dfrac{-2}{6};\dfrac{-1}{6};0;\dfrac{1}{6};...;\dfrac{7}{6};\dfrac{8}{6};\dfrac{9}{6}\right\}\)
c) \(3,456< x\le7,89\)
\(\Rightarrow x\in\left\{3,456;3,457,3,458;...;7,89\right\}\)
d) \(5,82< \overline{5,8x0}< 8,845\)
\(\Rightarrow x\in\left\{3;4\right\}\)
e) \(32,82< \overline{3x,850}< 35,845\)
\(\Rightarrow x\in\left\{3;4\right\}\)
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