427 x 234 - 325 x 168
16616 : 67 x 8815 : 43
67032 : 72 + 258 x 37
324 x 127 : 36 + 873
Tính giá trị biểu thức:
427 x 234 - 325 x 168
16616 : 67 x 8815 : 43
67032 : 72 + 258 x 37
324 x 127 : 36 + 873
TL
=45318
=50840
=10477
=2016
HT
cảm ơn anh Louis(Nhật)
Tính hợp lý :
A = 1995 x 873 + 1996 x 127
A = 1995 x 873 + 1996 x 127
A = 1995 x 873 + (1995 + 1) x 127
A = 1995 x 873 + 1995 x 127 + 127
A = 1995 x ( 873 + 127 ) + 127
A = 1995 x 1000 + 127
A = 1995000 + 127
A = 1995127
a) x * 412 + x * 15 - x * 325=1200
b) 136 * x - 72 * x + x * 36 = 39000
a) x*412+x*15-x*325=1200=>x*(412+15-325)=1200=>x*102=1200=>x=1200/102=\(\frac{200}{17}\)
b)136*x-72*x+x*36=39000=>x*(136-72+36)=39000=>x*100=39000=>x=39000/100=390
tính nhanh
234 x 1257 - 234 x257
1327 x 524 - 524 x327
325 x 1574 - 325 x325 - 325 x24
175 x 1274 - 175 x 273 - 175
a)=234(1257-257)
=234.1000
=234000
b)=524(1327-327)
=524.1000
=524000
c)=325(1574-325-24)
=325.1225
=398125
d)=175(1274-273-1)
=175.1000
=175000
234x (1257-257)= 234 x 1000 = 234000
1327 x 524 - 524 x 327 = 524 x (1327 - 327 ) = 524 x 1000 = 524000
325x1574 - 325 x 325 -325 x24 =325 x(1574 - 325 - 24 )= 325 x 1225 =398125
175 x 1274 - 175 x273 -175 = 175 x (1274 - 273 -1) = 175 x 1000= 175000
kkk mk nha bạn !!!!!!!!
a)234 x 1257 - 234 x257
= 234 x (1257 - 257)
= 234 x 1000
= 234000
b)1327 x 524 - 524 x327
= 524 x (1327 - 327)
=524 x 1000
=524000
c)325 x 1574 - 325 x325 - 325 x24
= 325 x (1574 -325 - 24)
=325 x 1225
=325 x 1000+325 x 100 +325 x125
=325000+32500+40625
=390125
d)175 x 1274 - 175 x 273 - 175
=175 x (1274-273-1)
=175 x 1000
=175000
tính bằng cách thuận tiện nhất
1235 x 6789 x ( 630 - 315 x 2 )
( 100 + 67 ) x 67 + ( 200 - 33 ) x 33
72 + 36 x 2 + 24 x 3 + 18 x 4 +12 x 2 +168
\(1235\text{×}6789\text{×}\left(630-315\text{×}2\right)\)
\(=1235\text{×}6789\text{×}\left(630-630\right)\)
\(=1235\text{×}6789\text{×}0=0\)
\(\left(100+67\right)\text{×}67+\left(200-38\right)\text{×}33\)
\(=167\text{×}67+167\text{×}33\)
\(=167\text{×}\left(67+33\right)\)
\(=167\text{×}100=16700\)
\(72+36\text{×}2+24\text{×}3+18\text{×}4+12\text{×}2+168\)
\(=72+72+72+72+24+168\)
\(=\left(72\text{×}4\right)+24+168=288+24+168=480\)
a) \(1235\times6789\times\left(630-630\right)\)
\(=1235\times6789\times0\)
\(=1235\times0\)
\(=0\)
b) \(167\times67+167\times33\)
\(=167\times\left(67+33\right)\)
\(=167\times100\)
=16700
Bài 1: Đặt tính rồi tính:
34,567 – 2,789 67,9 + 36 68,12 – 9,0178 57,9 – 1,97 2,35 + 987 |
45,9 x 68 3,9875 x 29 68,9 x 234 0,1247 x 67 2,986 x 43 |
89,5 x 45 8,9732 x 58 89,235 x 62 76,934 x 27 8,983 x 89 |
78,953 x 58 24,12 x 69 34,67 x 246 9,875 x 258 9,78 x 408 |
36018 : 46 70782 : 94 57000 : 456 31968 : 74 25627 : 49 |
Tính nhanh
13 x ( - 47 ) - 53 x 13
27 x ( - 67 ) + 33 x ( - 27 )
- 49 x 65 + 36 x ( - 49 ) + 49
136 x ( - 47 ) + 36 x 47
( - 48 ) x 72 + 36 x ( - 304 )
Ta có: \(13\cdot\left(-47\right)-53\cdot13\)
\(=13\cdot\left(-47-53\right)\)
\(=13\cdot\left(-100\right)=-1300\)
Ta có: \(27\cdot\left(-67\right)+33\cdot\left(-27\right)\)
\(=27\cdot\left(-67\right)-33\cdot27\)
\(=27\left(-67-33\right)\)
\(=27\cdot\left(-100\right)=-2700\)
Ta có: \(-49\cdot65+36\cdot\left(-49\right)+49\)
\(=-49\cdot65+\left(-49\right)\cdot36+\left(-49\right)\cdot\left(-1\right)\)
\(=-49\cdot\left(65+36-1\right)\)
\(=-49\cdot100=-4900\)
Ta có: \(136\cdot\left(-47\right)+36\cdot47\)
\(=\left(-136\right)\cdot47+36\cdot47\)
\(=47\cdot\left(-136+36\right)\)
\(=47\cdot\left(-100\right)=-4700\)
Ta có: \(\left(-48\right)\cdot72+36\cdot\left(-304\right)\)
\(=-96\cdot36+36\cdot\left(-304\right)\)
\(=36\cdot\left(-96-304\right)\)
\(=36\cdot\left(-400\right)=-14400\)
1.tính nhanh
425×3475+425×6525
234 x 1257 - 234 x 257
3876 x 375 + 375 x 6124
1327 x 524 - 524 x 327
257 x 432 + 257 x 354 + 257 x 214
325 x 1574 - 325 x 325 - 325 x 249
312 x 425 + 312 x 574 + 312
175 x 1274 - 175 x 273 - 175
a) (100 + 67) x 67 + (200 – 33) x 33 b) 45,651 x 73 + 45,651 x 20 + 45,651 x 7 c) 14,2 x 30 + 14,2 x 57 + 14,2 x 13 d) 72 + 36 x2 + 24 x 3 + 18 x 4 + 12 x 6 + 168 e) (8,27 + 7,16 + 9,333) – (7,27 + 6,16 + 8,33) | g) 1,5 + 2,5 + 3,5 + 4,5 +… + 8,5 h) 7,63 x 12,47 + 12,47 x 2,37 i) 37,2 x 101 – 37 – 0,2 k) 112,37 x 4,29 – 4,29 x 12,37 l) 17,4 x 52 + 57 x 17,4 – 17,4 x 9 i) 28 + 62 x a x ( a x 1 – a : 1) + 28 x 8 + 2 |