3,27x1,6+3,27x8,4

=3,27x(1,6+8,4)

=3,27x10

=0,327

5,26 x 1,5 - x = 4,6

=> 7,89 - x = 4,6

=>  x = 7,89 - 4,6

=> x = 3,29

5.26*1.5-x=4.6

7.89-x=4.6

x=7.89-4.6

x=3.29

x = 3,29 

3,29 

hok tốt

dddddddddddddd

5,26 x1,5 - X =4,6

7,89 - X =4,6

X =7,89-4,6 

X =3,29

a)5*2^2-18:3=20-6=14

b)17*85+15*17-120=17*(120-85+15)=17*20=340

c2^3*17-2^3*14=2^3(17-14)=8*3=24

đề bài

35.11.0,1.0,25.100.(3:0,4-7,5)

a)\(=\frac{2017}{2016}.\frac{3}{4}-\frac{1}{2016}.\frac{3}{4}\)

\(=\frac{3}{4}\left(\frac{2017}{2016}-\frac{1}{2016}\right)\)

\(=\frac{3}{4}.1\)

\(=\frac{3}{4}\)

b)\(=\frac{2015}{2016}\left(\frac{1}{2}+\frac{1}{3}-\frac{5}{6}\right)\)

\(=\frac{2015}{2016}.0\)

\(=0\)

Câu 1:

57x26+57x43+57x31

= 57x(26+43+31)

= 57x100

=5700

Câu 2:

177x 56- 56x56+ 121x44

= (177-56)x 56+ 121x44

= 122x56 + 121x44

= 121x(56+44)

=121x100

=12100

\(57.26+57.43+57.31\)

\(=57.\left(26+43+31\right)\)

\(=57.100\)

\(=5700\)

\(177.56-56.56+121.44\)

\(=56.\left(177-56\right)+121.44\)

\(=56.121+121.44\)

\(=121.\left(56+44\right)\)

\(=121.100\)

\(=12100\)

\(68.42+34.16\)

\(=34.2.42+34.16\)

\(=34.84+34.16\)

\(=34\left(84+16\right)\)

\(=34.100\)

\(=3400\)

\(\frac{4}{5}.\frac{3}{7}+\frac{4}{5}.\frac{6}{7}-\frac{4}{5}.\frac{4}{14}\)

\(=\frac{4}{5}.\left(\frac{3}{7}+\frac{6}{7}-\frac{4}{14}\right)\)

\(=\frac{4}{5}.1\)

\(=\frac{4}{5}\)

\(\frac{4}{5}\times\frac{3}{7}+\frac{4}{5}\times\frac{6}{7}-\frac{4}{5}\times\frac{4}{14}\)

\(=\frac{4}{5}\times\left(\frac{3}{7}+\frac{6}{7}-\frac{4}{14}\right)\)

\(=\frac{4}{5}\times1\)

\(=\frac{4}{5}\)

\(\frac{4}{5}\times\frac{3}{7}+\frac{4}{5}\times\frac{6}{7}-\frac{4}{5}\times\frac{4}{14}.\)

\(=\frac{4}{5}\times\left(\frac{3}{7}+\frac{6}{7}-\frac{4}{14}\right)\)

\(=\frac{4}{5}\times\left(\frac{3}{7}+\frac{6}{7}-\frac{2}{7}\right)\)

\(=\frac{4}{5}\times\frac{7}{7}\)

\(=\frac{4}{5}\times1\)

\(=\frac{4}{5}\)

b1:4^10.8^15 = (2^2)^10.(2^3)^15 = 2^20.2^45 = 2^65