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a: =-12/20+5/20-6/20
=-13/20
b: =10/50-45/50-14/50
=-49/50
c: =31/23-7/32-8/23=1-7/32=25/32
\(568-\left\{5.\left[143-\left(4-1\right)^2\right]+10\right\}:10\)
\(=568-\left[5.\left(143-3^2\right)+10\right]:10\)
\(=568-\left[5.\left(143-9\right)+10\right]:10\)
\(=568-\left(5.134+10\right):10\)
\(=568-68\)
\(=500\)
568 - { 5 [ 143 - ( 4 - 1 )2 ] + 10 } : 10
=568 - { 5 . ( 143 - 32 ) + 10 } :10
=568 - { 5 . ( 143 - 9 ) + 10 ) : 10
=568 - ( 5 . 134 + 10 ) : 10
=568 - 68
=500
568 - { 5 [ 143-(4-1)]2 +10} :10
= 568 - (5 * 140^2 +10) :10
= 568 - 9801
= 9233
568 - { 5.[ 143 - ( 4-1)^2]+10} : 10
= 568 - { 5.[ 143 - ( 4^2-1^2]+10}:10
= 568 - { 5.[ 143 - 15 ] + 10 } : 10
= 568 - { 5. 128 + 10 } : 10
= 568 - 650 : 10
= 568 - 65
= 503
a, 568 + 568 x 135 - 568 x 36
= 568 x ( 1 + 135 - 36)
= 568 x 100
56 800
b, 17 x 49 + 49 x 37 + 54 x 26 + 54 x 25
= 49 x ( 17 + 37) + 54 x ( 26 + 25 )
= 49 x 54 + 54 x 51
= 54 x ( 49 + 51)
= 54 x 100
= 5 400
c, 14 x 35 x 5 + 10 x 25 x 7 + 20 x 70
= ( 2 x 35) x ( 7 x 5) + ( 10 x 7) x 25 + 20 x 70
= 70 x 35 + 70 x 25 + 20 x 70
= 70 x ( 35 + 25 + 20)
= 70 x 80
= 5 600
a) 568 + 568 x 135 - 568 x 36
= 568 x ( 1+1+135-1-36 )
=568 x 100
=5680
b) 17 x 49 + 49 x 37 + 54 x 26 + 54 x 25
= 49 x ( 17 + 37 ) + 54 x ( 26 + 25 )
= 49 x 54 + 54 x 51
= 54 x ( 49 + 51 )
= 54 x 100
= 5400
c) 14 x 35 x 5 + 10 x 25 x 7 + 20 x 70
= 70 x 35 + 10 x 25 x 7+ 20 x 70
= 70 x 35 + 250 x 7 + 20 x 70
= 70 x 35 + 70 x 25 + 20 x 70
= 70 x (35+25+20)
= 70 x 80
= 5600
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a)\(568-\left\{5.\text{[}143-\left(4-1\right)^2\text{]}+10\right\}:10\)
\(=568-\left\{5.\left[143-3^2\right]+10\right\}:10\)
\(=568-\left\{5.134+10\right\}\text{ }\)
\(=568-\left(670+10\right)\)
\(=568-680\)
\(=-112\)
b)\(10^2-\left[60:\left(5^6:5^4-3\times5\right)\right]\)
\(=100-\left[60-\left(6^2-15\right)\right]\)
\(=100-\left(60-\left(36-15\right)\right)\)
\(=100-60-36+15\)
\(=19\)
\(a)\)\(568-\left\{5\left[143-\left(4-1\right)^2\right]+10\right\}\div10\)
\(=\)\(568-\left\{5\left[143-3^2\right]+10\right\}\div10\)
\(=\)\(568-\left\{5\left[143-9\right]+10\right\}\div10\)
\(=\)\(568-\left\{5.134+10\right\}\div10\)
\(=\)\(568-\left\{670+10\right\}\div10\)
\(=\)\(568-680\div10\)
\(=\)\(568-68\)
\(=\)\(500\)
\(b)\)\(10^2-\left[60\div\left(5^6\div5^4-3\times5\right)\right]\)
\(=\)\(10^2-\left[60\div\left(5^2-15\right)\right]\)
\(=\)\(10^2-\left[60\div\left(25-15\right)\right]\)
\(=\)\(10^2-\left[60\div10\right]\)
\(=\)\(100-6\)
\(=\)\(94\)