425. 7.4-170.60
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Tính nhanh
a) 27.26 + 27.64
b) 25.37 + 25.63 - 150
c) 425.7.4 = 170.60
d) 0.9.14 + 6.17.12 + 19.4.18
a, 27.26+27.64
=27.(26+64)
=27.90
=2430
b,25.37+25.63-150
=25.(37+63)-150
=25.110-150
=2750-150
=2600
c,425.7.4=170.60
=1700.7=170.10.6
=1700.7-1700.6
=1700.(7-6)
=1700
d,0.9.14+6.17.12+19.4.18
=0+6.17.12+19.4.18
=6.3.4.17+19.4.18
=18.4.17+19.4.18
=18.4.(17+19)
=72.36=2592
425x27+425x72+425
=425x27+425x72+425x1
=425x(27+72+1)
=425x100
=42500
425 x 32 + 69 x 425 - 425
= 425 x 32 + 69 x 425 - 425 x 1
= 425 x (32+69-1)
= 425 x 100
= 42500
1) \(7.4^x=7.4^3\Leftrightarrow4^x=4^3;x=3\)
2) \(\frac{3}{2.5^x}=\frac{3}{2.5^{12}}\Leftrightarrow5^x=5^{12};x=12\)
\(2^x=2.2^8=2^9;x=9\)
4) \(5.3^x=7.3^5-2.3^5\Leftrightarrow5.3^x=3^5.\left(7-2\right)\)
\(\Leftrightarrow3^5.x=3^5.5;x=5\)
= 48.(9.8+7.4)+52.(72+2.14)
=48.100+52.100
=100(48+52)
=100.100
=10000
`3/7 .4/11+3/7 .7/11-2`
`= 3/7 . ( 4/11 + 7/11)-2`
`= 3/7 . 11/11 -2`
`=3/7 . 1-2`
`= 3/7-2`
`= 3/7 - 14/7`
`=-11/7`
`3/7*4/11+3/7*7/11-2`
`=3/7*(4/11+7/11)-2`
`=3/7*1-2`
`=3/7-2`
`=3/7-14/7`
`=-11/7`
425.7.4-170-60
= 2975.4-170-60
=11900-170-60
=11730-60
= 11670
cảm ơn nha