Trả lời

(28.9-190).25-1790:45

=(252-190).25-2790:45

=62.25-62

=1488

2.33+3.7.11-9.22

=66+231-198

=99

Chúc học tốt nha !

\(2\times33+3\times7\times11-9\times22\)

\(=2\times33+7\times33-6\times33\)

\(=33\times\left(2+7-6\right)\)

\(=33\times3=99\)

Bài làm

   ( 28 x 9 - 190 ) x 25 - 2790 : 45

= ( 252 - 190 ) x 25 - 62

= 62 x 25 - 62

= 62 x ( 25 - 1 )

= 62 x 24

= 1488

   2 x 33 + 3 x 7 x 11 - 9 x 22

= 66 + 231 - 198

= 99

# Chúc bạn học tốt #

\(\frac{5,4:0,4\times1420+4,5\times780\times3}{3+6+9+12+15+18+21+24+27}\)

\(=\frac{13,5\times1420+13,5\times780}{\left(3+27\right)+\left(6+24\right)+\left(9+21\right)+\left(12+18\right)+15}\)

\(=\frac{13,5\times\left(1420+780\right)}{30+30+30+30+15}\)

\(=\frac{13,5\times2200}{135}\)

\(=\frac{29700}{135}\)

\(=220\)

bài 2 

= \(\frac{92}{135}\)

\(\left(\frac{1}{3}+\frac{4}{2}\cdot\frac{1}{2}\right):\left(\frac{18}{9}-113\right)\)

\(=\left(\frac{1}{3}+1\right):\left(2-113\right)\)

\(=\frac{4}{3}:\left(-111\right)\)

\(=\frac{-4}{333}\)

\(\frac{20}{45}+\left(\frac{2}{3}+10\right):45\)

\(=\frac{20}{45}+\frac{\frac{2}{3}+10}{45}\)

\(=\frac{20+10+\frac{2}{3}}{45}\)

\(=\frac{30}{45}+\frac{2}{3}:45\)

\(=\frac{2}{3}+\frac{2}{3}:45\)

\(=\frac{2}{3}:\left(1+45\right)=\frac{2}{3}:46\)

\(=\frac{1}{69}\)

\(\frac{9^{14}.25^5.8^7}{8^{12}.615^3.25^3}\)

\(=\frac{\left(3^3\right)^{14}.\left(5^2\right)^5.8^7}{8^{12}.\left(3.5.41\right)^3.\left(5^2\right)^3}\)

\(=\frac{3^{42}.5^{10}.8^7}{8^{12}.3^3.5^7.41^3}\)

\(=\frac{3^{39}.5^3}{8^5.41^3}\)

Ta có :

5/18 - 1/18( x- 2 ) = -5/9

1/18(x - 2 ) = 5/18 -(-5/9)

1/18(x-2) = 5/6

x - 2 = 5/6 : 1/18

x - 2 = 15

x = 15 + 2

x = 17

Hok tốt !

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280 - x.9 = 450

x.9 = 280 - 450

x.9 = -170

x= -170/9