a)745 – 5(120 – 75) – 70
b) 27. 332 + 93. 43 + 57. 61 + 69. 57
c)34. 75 + 75. 66 – 65. 100
d) 220 – [32. 33 – (12 – 7^0)2]
e) [504 – (52. 8 + 70) : 3^3 + 6] : 125
f) 101 + 102 + 103 + . . . . . + 200 + 201
g) 11 + 22 + 33 + 44 + . . . . . + 99 + 110
a)745 – 5(120 – 75) – 70 b) 27. 332 + 93. 43 + 57. 61 + 69. 57 c)34. 75 + 75. 66 – 65. 100 d) 220 – [32. 33 – (12 – 7^0)2]
By Aubrey
Đáp án:
Giải thích các bước giải:
a) 745 – 5 . ( 120 – 75) – 70 b) 27 . 332 + 93 . 43 + 57 . 61 + 69 . 57
= 745 – 5 . 45 – 70 = 8964 + 3999 + 3477 + 3933
= 745 – 225 – 70 = 12963 + 7410
= 520 – 70 = 20373
= 450
c) 34 . 75 + 75 . 66 – 65 . 100 d) 220 – [ 32 . 33 – ( 12 – 7∧0) 2 ]
= 75 . ( 34 + 66 ) – 65 . 100 = 220 – [ 32 . 33 -(12 -1) . 2 ]
= 75 . 100 – 65 .100 = 220 – [ 32 . 33 – 11 . 2 ]
= 100 . ( 75 – 65) = 220 – [ 1056 – 22 ]
= 100 . 10 = 220 – 1034
= 1000 = -814
e) [ 504 – ( 52 . 8 + 70 ) : 3∧3 + 6 ] : 125 f) 101 + 102 + 103 +………..+ 200+ 201
= [ 504 – (52 . 8 + 70 ) : 27 + 6 ] : 125 =( 101 + 201) : 100 : 2
= [ 504 – ( 416 + 70 ) : 27 + 6 ] : 125 = 302 . 101 : 2
= [ 504 – 486 : 27 + 6 ] : 125 = 30502 : 2
= [ 504 – 18 + 6 ] : 125 = 15251
= [ 486 + 6 ] : 125
= 492 : 125
= 3,936
g) 11 + 22 + 33 + 44+……………+ 99 + 110
=( 11 + 110 ) . 10 : 2
= 121 . 10 : 2
= 1210 : 2
= 605
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