Question

tinh nhanh

a,[42 nhan 43 cong 43 nhan 57 cong 63] cong 506 chia 4

b,17 nhan 4 cong 8 nhan 4 cong 3 nhan 100

Answer 1

b)17x4+8x4+3x100

=17x4+8x4+(3x25)x4

=4x(17+8+75)

=4x100

=400

Answer 2

Sửa lại đề luôn nhé

a . (( 42 * 43 + 43 * 57 + 63 ) + 506 ) : 4

= (( 43 * 42 + 43 * 57 + 43 + 30 ) + 506 ) : 4

= (( 43 * ( 42 + 57 + 1 ) + 30 ) + 506 ): 4

=  (( 43 * 100 + 30 ) + 506 ) : 4 

= ( 4330 + 506 ) : 4 

= 4836 : 4

= 1209

Answer 3

a . [42 x 43 + 43 x 57 + 63 ] + 506 : 4

= [ 43 x ( 57 + 42 ) + 63 ] + 126,5

= 43 x 99 + 63 + 126,5

= 4257 + 63 + 126,56

= 4320 + 126,56

= 4446,56

b . 17 x 4 + 8 x 4 + 3 x 100

= 17 x 4 + 8 x 4 + ( 3 x 25 ) x 4

= 4 x ( 17 + 8 + 75 )

= 4 x 100

= 400