M I CÂU 0,5Đ Ỗ0,25+0,25A) 43 – 6 . 23 = 64 – 6.8 = 64 – 48 = 160,2...
Bài 1 : M i câu 0,5đ ỗ0,25+0,25a) 4
3
– 6 . 23
= 64 – 6.8 = 64 – 48 = 160,25+ 0,25b) 135 . 62
+ 135 . 72
– 135 . 75= 135. 36 + 135.49 – 135.75 = 135.(36 + 49 – 75) = 135.10 = 13500,25+c) 20161
– [138 – 8. (52
– 32
)] = 2016 – [138 – 8.(25 – 9)]0,25 = 2016 – [138 – 8.16]= 2016 – [138 – 128] = 2016 – 10 = 2006d) 45 + 47 + 49 + . . . + 101S s h ng : (101 – 45) : 2 + 1 = 29 (s h ng)ố ố ạ ố ạ+ 0,25T ng là : (45 + 101). 29 : 2 = 2117.ổ