Thực hiện các phép tính sau:a) 4.25 - 12.5 + 170 : 10;b) (7 + 33 : 32).4 - 3;c) 12 : {400 : [500 - (125 + 25.7)]};d) 168 + {[2.(24 + 32) -2560] : 72}.Hướng dẫn giải:a)\(\text{4.25 -12.5 + 170 :...
Đọc tiếp
Thực hiện các phép tính sau:
a) 4.25 - 12.5 + 170 : 10;
b) (7 + 33 : 32).4 - 3;
c) 12 : {400 : [500 - (125 + 25.7)]};
d) 168 + {[2.(24 + 32) -2560] : 72}.
Hướng dẫn giải:a)
\(\text{4.25 -12.5 + 170 : 10}\\ =100-60+17\\ =40+17\\ =57.\)
b)
\(\left(7+3^3:3^2\right).4-3\\ =\left(7+3\right).4-3\\ =40-3\\ =37.\)
c)
\(12:\left\{400:\left[500-\left(125+25.7\right)\right]\right\}\\ =12:\left\{400:\left[500-\left(125+175\right)\right]\right\}\\ =12:\left[400:\left(500-300\right)\right]\\ =12:\left(400:200\right)\\ =12:2\\ =6.\)
d)
\(168+\left\{\left[2.\left(2^4+3^2\right)-256^0\right]:7^2\right\}\\ =168+\left\{\left[2.\left(16+9\right)-1\right]:49\right\}\\ =\left(2.25-1\right):49\\ =49:49\\ =1.\)
a)
4 . 25 – 12 . 25 + 170 : 10
= (4 . 25) – (12 . 25) + (170 : 10)
= 100 - 300 + 17
= -183
b)
(7 + 33 + 32) . 4 – 3
= (7 + 27 + 9) .4 – 3
= 43 . 4 – 3
= (43 . 4) – 3
= 45
c)
12 : {400 : [500 – (125 + 25 . 7)}
= 12 : {400 : [500 – (125 + 175)}
= 12 : (400: 200)
= 12 : 2
= 6
d)
168 + {[2.(24 + 32) - 2560] : 72}.
= 168 + [2 . (16 + 9) – 1] : 49
= 168 + 49: 49
= 168 + 1
= 167
a)
4 . 25 – 12 . 25 + 170 : 10
= (4 . 25) – (12 . 25) + (170 : 10)
= 100 - 300 + 17
= -183
b)
(7 + 33 + 32) . 4 – 3
= (7 + 27 + 9) .4 – 3
= 43 . 4 – 3
= (43 . 4) – 3
= 45
c)
12 : {400 : [500 – (125 + 25 . 7)}
= 12 : {400 : [500 – (125 + 175)}
= 12 : (400: 200)
= 12 : 2
= 6
d)
168 + {[2.(24 + 32) - 2560] : 72}.
= 168 + [2 . (16 + 9) – 1] : 49
= 168 + 49: 49
= 168 + 1
= 167