Question

Thực hiện tính bằng cách hợp lí(nếu có thể)

a, 28 . (-2)³ - { 136 + [54 - 28 : (69 - 71)² ]}

b, 203 . 46 - 203. 37 + 203

c, 21+ 23+ 25+ 27+ 29- 31- 33- 35- 37- 39

d, 18 . 17 - 3. 6. 37

e, 33. ( 107- 112) - 107 . ( 33- 112)

Answer 1

a, 28 . (-2).3 - { 136 + [54 - 28 : (69 - 71).2 ]}

=-168- { 136 + [54 - 28 : (-2).2 ]}

=-168 - [136 + (54+28)]

=-168 - 218

=-386

b) 203.46-203.37+203

=203.46-203.37+203.1

=203.(46-37+1)

=203.10

=2030

c)21+23+25+27+29-31-33-35-37-39

=(21-31)+(23-33)+(25-35)+(27-37)+(29-39)

= -10 + (-10) + (-10) + (-10) + (-10)

=-50

d) 18.17-3.6.17

=18.17-18.17

= 0

e,33. ( 107- 112) - 107 . ( 33- 112)

=33.107- 33.112- 107.33+107.112

=(33.107- 33.112- 107.33)+107.112

=33(107-112-107)+107.112

=-33.112+107.112

=112.(-33+107)

=112.74

=8288