# .3. Tính nhanh a) (–219) + 263 + 319 + (–163) b) (–125).25.(–8).(–4).123 c) (225 – 1576) – (125 – 1576 + 176) d) 63 – 9.(10 + 7) e) 45.( –69) + 31.(–4

By Eden

.3. Tính nhanh
a) (–219) + 263 + 319 + (–163) b) (–125).25.(–8).(–4).123
c) (225 – 1576) – (125 – 1576 + 176) d) 63 – 9.(10 + 7)
e) 45.( –69) + 31.(–45) + (–27) g) (–23).(–48) – 23.148 – 245
h) 47.(27 – 15) – 27.(47 – 15) i) 162 (73 49) (73 162)

### 0 bình luận về “.3. Tính nhanh a) (–219) + 263 + 319 + (–163) b) (–125).25.(–8).(–4).123 c) (225 – 1576) – (125 – 1576 + 176) d) 63 – 9.(10 + 7) e) 45.( –69) + 31.(–4”

1. hoaiphuong

a) $(–219) + 263 + 319 + (–163)$

$= [(-219) + 319] + [263 + (-163)$

$= 100 + 100$

$= 200$

b) $(–125) × 25 × (–8) × (–4) × 123$

$= [(-125) × (-8)] × [25 × (-4)] × 123$

$= 1000 × 100 × 123$

$= 100000 × 123$

$= 12300000$

c) $(225 – 1576) – (125 – 1576 + 176)$

$= 225 – 1576 – 125 – 1576 – 176$

$= (225 – 125) + (1576 – 1576) – 176$

$= 100 – 176$

$= -76$

d) $63 – 9 × (10 + 7)$

$= 63 – 90 – 63$

$= -90$

e) $45 × ( –69) + 31 × (–45) + (–27)$

$= 45 × (-69 – 31) + (-27)$

$= 45 × (-100) – 27$

$= -4500 – 27$

$= -4527$

g) $(–23) × (–48) – 23 × 148 – 245$

$= (-23) × (-48 + 148) – 245$

$= (-23) × 100 – 245$

$= -2300 – 245$

$= -2545$

h) $47 × (27 – 15) – 27 × (47 – 15)$

$= 47 × 27 – 47 × 15 – 27 × 47 + 27 × 15$

$= ( 47 × 27 – 27 × 47) + 15 × (27 – 47)$

$= 0 + 15 × (-20)$

$= -300$

i) $62 – (73 – 49) + (73 – 162)$

$= 62 – 73 + 49 + 73 – 162$

$= (62 – 162) + [(-73) + 73] + 49$

$= (-100) + 0 + 49$

$= (-100) + 49$

$= -51$

Trả lời
2. truongankim

Đáp án:

a) (–219) + 263 + 319 + (–163)

= [(-219) + 319] + [236 + (-163)]

= 100 + 100

= 200

b) (–125).25.(–8).(–4).123

= [(-125). (-8)] . [(25 . (-4)] . 123

= 1000 . (-100) . 123

= -12300000

c) (225 – 1576) – (125 – 1576 + 176)

= 225 – 1576 – 125 + 1576 – 176

= (225 – 125) + (1576 – 1576) – 176

= 100 -176

= -76

d) 63 – 9.(10 + 7)

= 63 – 90 – 63

= -90

e) 45.( –69) + 31.(–45) + (–27)

= 45 . (-69 – 31) + (-27)

= 45 . (-100) – 27

= -4500 – 27

= – 4527

g) (–23).(–48) – 23.148 – 245

= (-23) . (-48 + 148) – 245

= (-23) . 100 – 245

= -2300 – 245

= -2545

h) 47.(27 – 15) – 27.(47 – 15)

= 47 . 27 – 47 . 15 – 27 . 47 + 27 . 15

= ( 47 . 27 – 27 . 47) + 15 . (27 – 47)

= 0 + 15 . (-20)

= -300

i) 162 (73 49) (73 162) ( câu này tất cả là dấu nhân à em?)

Trả lời