Bài 7: Thực hiện phép tính (tính hợp lí nếu có thể)
a) 78 349 – 10 240 + 56 711
b) 234. 66 + 54. 80
c) 13. 89 – 43. 17 + 339. 7
d) 2 085 – 1 196 : 26
e) 214. 72 – 45. 214 – 214.27
g) (4568 + 3759) – ( 4563 + 3754)
h) (2546 –1321) – (2530 – 1351)
i)16 . 114 + 53 . 32 k)15 . 56 + 30 + 42 . 15
m) 123 . 456 + 456 . 321 – 256 .
Bài 7: Thực hiện phép tính (tính hợp lí nếu có thể)
a) 78 349 – 10 240 + 56 711
= ( 78 349 + 56 711 ) – 10 240
= 635060 - 10240
= 624820
b) 234. 66 + 54. 80
= 15444 + 4320
= 19760
c) 13. 89 – 43. 17 + 339. 7
= 1157 - 731 + 2373
= (1157 + 2373) - 731
= 3530 - 731
= 2799
d) 2 085 – 1 196 : 26
= 2 085 – 46
= 2039
e) 214. 72 – 45. 214 – 214.27
= 214.( 72 – 45 – 27 )
= 214 . 0
= 0
\(a,=68109+56711=124820\)
\(b,=15444+4320=10764\)
\(c,1157-731+2373=426+2373=2799\)
\(d,=2085-46=2039\)
\(e,214.\left(72-45-27\right)=214.\left(-20\right)=-4200\)
\(g,=8327-1179=7148\)
\(h,=1225-1179=46\)
\(i,2304+1696=4000\)
\(k,=840+30+630=1500\)
\(m,456\left(123+321\right)-256=456.444-256=202464-256=202208\)
g) (4568 + 3759) – ( 4563 + 3754)
= 4568 + 3759 – 4563 - 3754
= ( 4568 - 4563 ) +( 3759 –3754)
= 5 + 5= 10
i)16 . 114 + 53 . 32
= 16 ( 114 + 53 . 2)
= 16 . 220
= 3520
k)15 . 56 + 30 + 42 . 15
= 15 ( 56 + 2 + 42)
= 15 . 100
= 1500
m) 123 . 456 + 456 . 321 – 256 .
= 456 ( 123 + 321) - 256=
= 456 . 444 - 256
= 202464 - 256
= 202258
a) = ( 78 349 + 56 711 ) - 10240
= 635060 - 10240
= 624820
b) = 15444 + 4320
= 19760
c) = 1157 - 731 + 2373 = 2799
d) = 2085 - 46 = 2039
e) = 214. ( 72 - 45 - 27 )
= 214 . 0 = 0
g) = 4568 + 3759 - 4563 - 3754
= ( 4568 - 4563 ) + ( 3759 - 3754 )
= 5 + 5 = 10
i) = 1824 + 1696
= 3520
h) = 2546 - 1321 - 2530 + 1351
= ( 2546 - 2530 ) + ( 1321 - 1351 )
= 16 + 6 = 22
m) 456 . ( 123 + 321 ) - 256
= 456 . 444 - 256
= 206460 - 256 = 206204
\(\text{a) 78 349 – 10 240 + 56 711}\)
\(=(78349+56711)-10240\)
\(=635060-10240\)
\(=624820\)
\(b)\)\(\text{234. 66 + 54. 80}\)
\(=15444-4320\)
\(=19760\)
\(\text{c) 13. 89 – 43. 17 + 339. 7}\)
\(=1157-731+2373\)
\(=426+2373\)
\(=2799\)
\(\text{d) 2 085 – 1 196 : 26}\)
\(=2085-46\)
\(=2039\)
\(\text{e) 214. 72 – 45. 214 – 214.27}\)
\(=214.(72-45-27)\)
\(=214.0\)
\(=0\)
\(\text{g) (4568 + 3759) – ( 4563 + 3754)}\)
\(=4568+3759-4563-3754\)
\(=(4568-4563)+(3759-3754)\)
\(=5+5\)
\(=10\)
\(\text{h) (2546 –1321) – (2530 – 1351)}\)
\(=2546-1321-2530+1351\)
\(=(2546-2530)+(1351-1321)\)
\(=16+30\)
\(=46\)
\(\text{i)16 . 114 + 53 . 32}\)
\(=1824+1696\)
\(=3520\)
\(\text{k)15 . 56 + 30 + 42 . 15}\)
= \(840+30+630\)
\(=1500\)
\(\text{m) 123 . 456 + 456 . 321 – 256 . }\)
\(=456.(123+321)-256\)
\(=456.444-256\)
\(=202464-256\)
\(=202208\)
a) 78 349 – 10 240 + 56 711
= ( 78 349 + 56 711 ) - 10 240
= 135060 - 10 240
= 124 820
b) 234. 66 + 54. 80
= 15 444 + 4320
= 19764
c) 13. 89 – 43. 17 + 339. 7
= 1157 - 731 + 2373
= 426 + 2373
= 2799
d) 2 085 – 1 196 : 26
= 2 085 - 46
= 2039
e) 214. 72 – 45. 214 – 214.27
= 214 x 72 - 214 x 27 - 214 x 45
= 214 x ( 72 - 27 - 45 )
= 214 x 0
= 0
g) (4568 + 3759) – ( 4563 + 3754)
= 8327 - 8317
= 10
h) (2546 –1321) – (2530 – 1351)
= 1225 - 1179
= 46
i)16 . 114 + 53 . 32
= 1824 + 1696
= 3520
k)15 . 56 + 30 + 42 . 15
= 15 x 56 + 15 x 2 + 15 x 42
= 15 x ( 56 + 2 + 42 )
= 15 x 100
= 1500
m) 123 . 456 + 456 . 321 – 256 .
= 456 x ( 123 + 1 ) x 321 - 256
= 456 x 124 x 321 - 256
= 56544 x 321 - 256
= 18150624 - 256
= 18150368
a) 78 349 – 10 240 + 56 711
= 68 109 + 56 711
= 124 820
b) 234. 66 + 54. 80
= 15 444 + 4 320
= 19 764
c) 13. 89 – 43. 17 + 339. 7
= 1 157 - 731 + 2 373
= 426 + 2 373
= 2799
d) 2 085 – 1 196 : 26
= 2 085 - 46
= 2039
e) 214. 72 – 45. 214 – 214.27
= 15 408 - 9 630 - 5 778
= 5 778 - 5 778
= 0
g) (4568 + 3759) – ( 4563 + 3754)
= 8327 - 8317
= 10
h) (2546 –1321) – (2530 – 1351)
= 1225 - 1179
= 46
i)16 . 114 + 53 . 32
= 1824 + 1696
= 3520
k)15 . 56 + 30 + 42 . 15
= 840 + 30 + 630
= 1500
m) 123 . 456 + 456 . 321 – 256 .
= 56088 + 146 376 - 256
= 202208
