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mình thiếu 1 câu hhi
b) {( 10 - 2 . 3 ) .5] + 2 -2 . 6 } : 2 + ( 4 . 5 ) 2
a) (3x-24)73=2.74
3x-24=2.7 (Chia cả hai vế cho 73)
3x-16=14
3x=30
X=10
b)[(10 -x).2+5] : 3 -2 =3
(20-2x+5):3=5
25-2x=15
2x=10
X=5
Bài 2
{[(32+1).10-(8:2+6)]:2}+55-(10:5)3
={(9+1).10-10]:2}+55-23
=[(10.10-10):2]+55-8
=(90:2)+55-8
=45+55-8
=100-8
=92
a) {[( 32 + 1 ) . 10 - ( 8 : 2 + 6 ) ] : 2 } + 55 -( 10 : 5 )3
= ( 10 . 10 - 10 : 2 ) + 55 - 6
= 90 : 2 ) + 55 - 6
= 45 + 55 - 6
= 100 - 6
= 94
b) 100 - [ 60 - ( 9 - 2 )2 ] . 32
= 100 - [ 60 - 72 ] . 9
= 100 - [ 60 - 49 ] . 9
= 100 - 11 . 9
= 100 - 99
= 1
c) [ ( 1253 ) . 75 - ( 175 )5 : 5 ] : 20162017
= 0 : 20162017
= 0
+ bài d kg hiểu! Xin lỗi
\(\left\{\left[\left(3^2+1\right).10-\left(8:2+6\right)\right]:2\right\}+55-\left(10:5\right)^3\)
\(=\left\{\left[\left(9+1\right).10-\left(4+6\right)\right]:2\right\}+55-2^3\)
\(=\left\{\left[10.10-10\right]:2\right\}+55-8\)
\(=\left\{\left[100-10\right]:2\right\}+47\)
\(=\left\{90:2\right\}+47\)
\(=45+47\)
\(=92\)
Vậy...
Bài làm :
\(A.\left\{\left[\left(3^2+1\right).10-\left(8:2+6\right)\right]:2\right\}+55-\left(10:5\right)^3\)
\(=\left\{\left[10.10-\left(4+6\right)\right]:2\right\}+55-\left(10:5\right)^3\)
\(=\left[\left(100-10\right):2\right]+55-2^3\)
\(=\left(90:2\right)+55-8\)
\(=45+55-8\)
\(=92\)
\(B.\left\{\left[\left(10-2.3\right).5\right]+2-2.6\right\}:2+\left(4.5\right)^2\)
\(=\left\{\left[\left(10-6\right).5\right]+2-12\right\}:2+20^2\)
\(=\left[\left(4.5\right)+2-12\right]:2+400\)
\(=\left(20+2-12\right):2+400\)
\(=10:2+400\)
\(=5+400\)
\(=405\)
Học tốt nhé
a) {[(32 + 1).10 - (8:2 + 6)] : 2} + 55 - (10 : 5)3
= {[(9 + 1).10 - (4 + 6)] : 2} + 55 - 23
= {[10.10 - 10] : 2} + 55 - 23
= {[10(10 - 1)] : 2} + 55 - 8
= {[10.9] : 2} + 55 - 8
= 45 + 55 - 8 = 92
b) {[(10 - 2.3).5] + 2 - 2.6} : 2 + (4.5)2
= {[(10 - 6).5] + 2 - 12} : 2 + 202
= {[4 . 5] + 2 - 12} : 2 + 400
= {20 + 2 - 12} : 2 + 400
= 10 : 2 + 400 = 5 + 400 = 405