a = 35 × 10 + 48 : 6 - 14 × 9 =
a = 350 + 48 : 6 - 14 × 9
a = 350 + 8 - 14 × 9
a = 350 + 8 - 126
a = 358 - 126
a = 232
b = 7 × 100 - 19 × 9 - 72 : 8 =
b = 700 - 19 × 9 - 72 : 8
b = 700 - 171 - 72 : 8
b = 700 - 171 - 9
b = 529 - 9
b = 520
2 × a + b = 2 × ( a + b ) =
2 × 232 + 520 = 2 × ( 232 + 520 ) =
464 + 520 = 714
2 × ( 232 + 520 ) =
2 × 752 = 1504