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813.15-812.13=812.(8.15-13)=812.107
2512-25.2511=2512-2512=0
49-[35-(6-1)2 ]=49-(35-52)=49-(35-25)=49-10=39
=[(813.812).(15-13)] =(2512.2511)-25
=8.2 =25-25
=16 =1
Đúng k hộ mh cái
YẾN ƠI TUI BẠN BÀ NÈ
NHƯNG TUI HỔNG PHẢI LỚP 6 THÔNG CẢM NHA
a,\(3^3.3^2-3^5+5^8.1-5^{12}:5^4\)
=\(3^5-3^5+5^8-5^8\)
=0
9!-8!-7! :\(8^2\)
=8!.9-8!-8!.8
=8!.(9-1-8)
=8!.0
=0
B, 24.312+313
= 24 . 312 + 312 .3
= 312. ( 24+ 3)
= 312. 27
= 312. 33
= 315
a, ( - 168 ) + 72 . ( - 168 ) + ( - 168 ) . 27
= ( - 168 ) + ( - 12096 ) + ( - 4536 )
= - 12264 + - 4536
= - 16800
b, 22 . ( - 3 ) - ( 110 + 8 ) : ( - 3 )2
= 4 . ( - 3 ) - ( 1 + 8 ) : 9
= ( - 12 ) - 9 : 9
= ( - 12 ) - 1
= - 13
c, ( - 1075 ) - ( 29 - 1075 )
= ( - 1075 ) - ( - 1046 )
= - 29
d, ( - 9 ) + ( - 11 ) + 21 + ( - 1 )
= - 20 + 21 + ( - 1 )
= 1 + - 1
= 0
e, 30 + 12 + ( - 20 ) + ( - 12 ) - ( 30 - 20 ) + ( 12 - 12 )
= 42 + ( - 20 ) + ( - 12 ) - 10 + 0
= 22 + ( - 12 ) - 10 + 0
= 10 - 10 + 0
= 0 + 0
= 0
g, ( 13 - 135 + 49 ) - ( 13 + 49 )
= [( - 122 ) + 49 ] - 62
= ( - 73 ) - 62
= - 135
h, 35 - { 12 - [ ( - 14 ) + ( - 2 ) } ]
= 35 - { 12 - ( - 16 ) }
= 35 - 28
= 7
Bài 2:
a. x - 35 = ( - 12 ) - 3
x - 35 = - 15
x = - 15 + 35
x = 20
b, \(\frac{1}{4}\)+ \(\frac{1}{3}\): 3x = - 5
\(\frac{3}{12}+\frac{4}{12}\): 3x = - 5
\(\frac{7}{12}\): 3x = - 5
3x = \(\frac{7}{12}\): - 5
3x = \(\frac{-7}{60}\)
x = \(\frac{-7}{60}\): 3
x = \(\frac{-7}{180}\)
c,2x-1 = 8
2x-1 = 24
x = 4 + 1
x = 5
a)\(\left(10^2+11^2+12^2\right)\div\left(13^2+14^2\right)\)
\(=\left(100+121+144\right)\div\left(169+196\right)\)
\(=365\div365\)
\(=1\)
b) \(1.2.3...9-1.2.3...8-1.2.3...8^2\)
\(=1.2.3...8\left(9-1-8\right)\)
\(=1.2.3...8.0\)
\(=0\)
d) \(1152-\left(374+1152\right)+\left(-65+374\right)\)
\(=1152-374-1152-65+374\)
\(=\left(1152-1152\right)-65+\left(374-374\right)\)
\(=0-65+0\)
\(=-65\)
e) \(13-12+11+10-9+8-7-6+5-4+3+2-1\)
\(=13-\left(12-11\right)+\left(10-9\right)+\left(8-7\right)-\left(6-5\right)-\left(4-3\right)\)\(+\left(2-1\right)\)
\(=13-1+1+1-1-1+1\)
\(=13+0+0+0\)
\(=13\)
a)2^2 × 3 -[(2 × 3 - 5 ) ^ 10 +8]÷3^2
=2^2 × 3 - [(6-5) ^10+8]÷3^2
= 2^2 × 3-[1^10+8]÷3^2
=2^2×3 - [1+8]÷3^2
= 2^2 × 3 - 9 ÷ 3^2
=4×3-9÷9
= 12-1
=11
b)(-5)+[(-12)-5]+(15-13)
=-5 + -17 + 2
=-12 + 2
= -10
a) 22 . 3 - [ ( 2 . 3 - 5 )10 + 8 ] : 32
= 4 . 3 - [ ( 6 - 5 )10 + 8 ] : 9
= 12 - ( 110 + 8 ) : 9
= 12 - ( 1 + 8 ) : 9
= 12 - 9 : 9
= 12 - 1
= 11
b) ( -5 ) + [ ( -12 ) - 5 ] + ( 15 - 13 )
= ( -5 ) + ( -17 ) + 2
= -( 5 + 17 ) + 2
= ( -22 ) +2
= -( 22 - 2 )
= -20