Question

[hahaha]

12x53+53x172-53x84

35x34+35x95+65x75+65x54

86x7676-8686x76

6969x45-4545x59

351x67+351x16+649x83

42x53+47x156-47x114

3851:500+1149:500

4783:300-1783:300

52x9(148+135)+148x(48x135)

Answer 1

[Triệu Mẫn]

a) 12 x 53 + 53 x 172 - 53 x 84

= 53 x ( 12 + 172 - 84 )

= 53 x 100

= 5300

b) 35 x 34 + 35 x 95 + 65 x 75 + 65 x 54

= ( 35 x 34 + 35 x 95 ) + ( 65 x 75 + 65 x 54 )

= 35 x ( 34 + 95 ) + 65 x ( 75 + 54 )

= 35 x 129 + 65 x 129

= ( 35 + 65 ) x 129

= 100 x 129

= 12900

c) 86 x 7676 - 8686 x 76

= 86 x 76 x 101 - 86 x 101 x 76

= 0

d) 6969 x 45 - 4545 x 59

= 69 x 101 x 45 - 45 x 101 x 59

= 45 x 101 x ( 69 - 59 )

= 4545 x 10

= 45450

e) 351 x 67 + 351 x 16 + 649 x 83

= 351 x ( 67 + 16 ) + 649 x 83

= 351 x 83 + 649 x 83

= ( 351 + 649 ) x 83

= 1000 x 83

= 83000 

f) 42 x 53 + 47 x 156 - 47 x 114

= 42 x 53 + 47 x ( 156 - 114 )

= 42 x 53 + 47 x 42

= 42 x ( 53 + 47 )

= 42 x 100

= 4200

g) 3851 : 500 + 1149 : 500

= ( 3851 + 1149 ) : 500 

= 5000 : 500

= 10

h) 4783 : 300 - 1783 : 300

= ( 4783 - 1783 ) : 300

= 3000 : 300

= 10 

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