a, 32674 + 41335 + 326 + 665 b, 27 x 26 + 26 x 44 + 39 x 26
= 74009 + 991 = 702 + 1144 + 1014
= 75000 = 1846 + 1014
= 2860
a) = (32674 + 326) + (41335 + 665)
= 33000 + 42000 = 75000
b) = 26 x (27 + 44 + 39)
= 26 x 110 = 2860
Tìm X biết: (X x 5 - 19) + (X x 3 + 24) = 125
a, 35 x 8 + 64 : 8 – 723 : 3 b, 486 + 488 + 490 - 90 - 88 - 86