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a) 38 + 41 + 117 + 159 + 62
= ( 38 + 62 ) + ( 41 + 159 ) + 117
= 100 + 200 + 117
= 300 + 117
= 417
b) 42 . 53 + 47 . 156 - 47 .114
= 42 . 53 + 47 . ( 156 - 114 )
= 42 . 53 + 47 x 42
= 42 . ( 53 + 47 )
= 42 x 100
= 4 200
a,38 + 41 + 117 + 159 + 62
= 38 + 62 + 41 + 159 +117
= ( 38 + 62 ) + ( 41 + 159 ) + 117
= 100 + 200 + 117
= 300 + 117
= 417
b, 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
a) \(\left(-25\right).5.\left(-4\right).2\)
\(=\left[\left(-25\right).\left(-4\right)\right].\left(2.5\right)\)
\(=100.10=1000\)
b) \(\left(-456\right)-\left(67-456\right)\)
\(=-456-67+456\)
\(=\left(456-456\right)-67\)
\(=67\)
a ) 159 − 524 − 59 − 424 ; = 159 − 524 − 59 + 424 = 159 − 59 − 524 − 424 = 100 − 100 = 0 b ) 36 + 79 + 145 − 79 − 36 ; = 36 + 79 + 145 − 79 − 36 = 36 − 36 + 79 − 79 + 145 = 145 c ) 334 − 117 + 234 + 42 + 117 ; = 334 − 117 − 234 + 42 + 117 = 334 − 234 − 117 − 117 + 42 = 100 + 42 = 142 d ) 271 − − 43 + 271 − − 17 . = 271 − − 43 + 271 + 17 = 271 + 43 − 271 − 17 = 271 − 271 + 43 − 17 = 26
a,( 25 + 39 ) +21 = 25 + ( 39 + 21 ) = 25 + 60 =85
b,( 997+29 +3 +51)= ( 997 + 3 ) + ( 29 + 51 ) = 1000 + 80 = 1080
c. 578 + 125 + 422 + 375 = ( 578 + 422 ) + ( 125 + 375 ) = 1000 + 500 = 1500
d.915 + 85 + 117 + 23 = ( 915 + 85 ) + ( 117 + 23 ) = 1000 + 140 = 1140
a: =5+48=53
\(125:25+12.4=5+48=53\)
\(25-\left(62-75\right)+38=25+13+38=76\)