tính nhanh 12.14.15.6.7
24.3.5.10 b.,55.16.17.15
12.5.15.7 25. (187+18+1382 )
2.450.25.8 125.98.2.8.25
75.8.15.3 1122.34.2244.83
8466.15+170.4233
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25.(187+18+1382)
=25.(187+1400)
=25.187+1400
=25.1400+187
=35000+187
=35187
25.(187+18+1382)
= 25.(187+1400)
=25.1400+187
=3500 +187
= 35187
25x187+187x73+817x1+817x1
= 187x(25+73+1+1)
= 187x100
=18700
25 × 187 + 187 × 73 + 817 + 817
= 25 × 187 + 187 × 73 +187+187+1260
= 187 x ( 25+73+1+1) + 1260
= 187 x 100 + 1260
= 18700 + 1260
= 19960
chúc bn học tốt
1) 18+14+16+35+110+160+150+145+158+140+55+25
= (14+16)+(35+25)+(145+55)+(140+160)+(158+18)+(110+150)
= 30+ 60 +200+ 300+ 176+ 260
= 590+ 436= 1026.
2) 62+ 78 +48+ 96+85+ 91
= (62 +48)+ (96 +85 +91+ 78)
= 110 + 350= 460.
3) 107 +439 + 666 +673+ 358 + 187
= (107 + 673) + ( 439 + 666) + ( 358+ 187)
= 780 + (1105 + 545)
= 780+ 1650= 2430.
4) 187 + 62+ 78+48+ 96+ 85+ 91+107+ 439+ 666+ 673+ 358
= (187 + 673) + ( 62+ 78)+ (439+ 91)+ ( 85+ 358+ 107)+ (666+ 96+ 48)
= (860+ 140)+ (530+ 550+ 810)
= 1000+ 1890= 2890.
a. `306xx 18-306 xx 8=306 xx (18-8) =306 xx 10=3060`
b. `9 xx 9+25xx9 +33 xx18`
`=9 xx9 + 25 xx 9 + 33 xx 2 xx 9`
`=9x (9+25+33xx2)`
`=9 xx (9+25+66)`
`=9 xx 100`
`=900`
a) \(306\cdot18-306\cdot8=306\cdot10=3060\)
b) \(9\cdot9+25\cdot9\cdot33\cdot18=9\cdot9\cdot\left(1+25\cdot33\cdot2\right)=81\cdot1651=133731\)
a/ A= 119+(-213)+212+(-118)+2009
A= ! - 1 + 2009
A= 2009
b/ B=223+132+187-23-32-87
B = 200 + 100 + 100
B = 400
c/ C= -2012+(-596)+(-201)+496+301
C = -2012 - 100 + 100
C = -2012
d/ D= -329+(15-101)-(25-440)
D = 0
hok tốt!!!
\(a,A=119+\left(-213\right)+212+\left(-118\right)+2009\)
\(A=\left(119+212+2009\right)+\left[\left(-213\right)+\left(-118\right)\right]\)
\(A=2340+\left(-331\right)\)
\(A=2009\)
\(b,B=223+132+187-23-32-87\)
\(B=\left(223+132+187\right)+\left(-23-32-87\right)\)
\(B=542-142\)
\(B=400\)
a, 32.(-64) - 64.68
= -64( 32 + 68)
= -64 .100
= - 6400
b, -54.76 + 46.(-76)
= -76.(54 + 46)
= - 76. 100
= - 7600
c, 75.18 + 18.25
= 18.(75 + 25)
= 18 . 100
= 1800
d, (-4).(3).(-125)(-25).(-8)
= 3.(-4. (-25).((-125).(-8)
= 3.100.1000
= 300000