b )
B = 13a +19b+4a-2b
B = 17a + 17b
B = 17 ( a+ b) = 17 . 100 = 1 700
`B = 13a +19b+4a-2b`
`B = ( 13a + 4x) + (19b - 2b)`
`B = 17a + 17b`
`B = 17 . (a + b)`
`B = 17 . 100`
`B = 1700`
`#BaoL i n h`
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`#BaoL i n h`