10 - [(8² - 48) x 5 + (2³ x 10 + 8)] : 28

= 10 - [( 64 - 48) x 5 + (8 x 10 + 8)] : 28

= 10 - (16 x 5 + 88) : 28

= 10 - (80 + 88) : 28

= 10 - 168 : 28

= 10 - 6 ( Nhân chia trước cộng trừ sau bạn nhá)

= 4

Bạn nên thử lại bằng máy tính vì mình tính nhẩm nên chưa chắc đúng đâu bạn ạ! Nhưng dù đúng hay sai thì cách làm là vậy.

Đề bài yêu cầu tính hay sao em?

Ta có: \(10-\left[\left(8^2-48\right)\cdot5+\left(2^3\cdot10+8\right)\right]:28\)

\(=10-\left[16\cdot5+\left(8\cdot10+8\right)\right]:28\)

\(=10-\left(80+80+8\right):28\)

\(=10-168:28\)

\(=10-6=4\)

\(10-\left[\left(8^2-48\right).5+\left(2^3.10+8\right)\right]:28\)

\(=10-\left[\left(64-48\right).5+\left(8.10+8\right)\right]:28\)

\(=10-\left[16.5+\left(80+8\right)\right]:28\)

\(=10-\left[16.5+88\right]:28\)

\(=10-\left[80+88\right]:28\)

\(=10-168:28\)

\(=10-6=4\)

\(a,\frac{62}{7}:x=\frac{29}{9}:\frac{3}{56}\)

\(\frac{62}{7}:x=\frac{1624}{27}\)

\(x=\frac{62}{7}:\frac{1624}{27}=\frac{837}{5684}\)

\(b,\frac{1}{5}:x=\frac{1}{5}-\frac{1}{7}\)

\(\frac{1}{5}:x=\frac{2}{35}\)

\(x=\frac{1}{5}:\frac{2}{35}=\frac{7}{2}\)

\(c,\frac{2}{3}.x-\frac{4}{7}=\frac{1}{7}\)

\(\frac{2}{3}.x=\frac{1}{7}+\frac{4}{7}=\frac{5}{7}\)

\(x=\frac{5}{7}:\frac{2}{3}=\frac{15}{14}\)

\(d,\frac{2}{7}-\frac{8}{9}.x=\frac{2}{3}\)

\(\frac{8}{9}.x=\frac{2}{7}-\frac{2}{3}=-\frac{8}{21}\)

\(x=-\frac{8}{21}:\frac{8}{9}=-\frac{3}{7}\)

\(e,\frac{4}{7}+\frac{5}{9}:x=\frac{1}{5}\)

\(\frac{5}{9}:x=\frac{1}{5}-\frac{4}{7}=-\frac{13}{35}\)

\(x=\frac{5}{9}:-\frac{13}{35}=\frac{175}{117}\)

\(i,\frac{2}{5}-\frac{2}{5}.x=\frac{2}{5}\)

\(\frac{2}{5}.\left(1-x\right)=\frac{2}{5}\)

\(1-x=\frac{2}{5}:\frac{2}{5}=1\)

\(x=1-1=0\)

\(g,\frac{2}{3}+\frac{1}{3}:x=-1\)

\(\frac{1}{3}:x=-1-\frac{2}{3}=-\frac{5}{3}\)

\(x=\frac{1}{3}:-\frac{5}{3}=-\frac{1}{5}\)

học tốt nha

ta có: \(\frac{-7}{8}=-0,875;\frac{-2}{3}=-0,6\)

\(\frac{-3}{4}=-0,75;\frac{-18}{19}=-0,94;\frac{-27}{28}=-0,96\)

\(\Rightarrow\frac{-2}{3}>\frac{-3}{4}>\frac{-7}{8}>\frac{-18}{19}>\frac{-27}{28}\)

mk ko nhớ vì mh học lớp 9 rồi

a,47-[(45×16-25×12):14]

=47-[(720-300):14]

=47-[420:14]

=47-30

=17

b,50-[(20-8):2+34]

=50-[12:2+34]

=50-[6+34]

=50-40

=10

c,100-[60:(5^2-15)]

=100-[60÷(25-15)]

=100-[60÷10]

=100-6

=94

d,50-[(50-8×5)÷2+3]

=50-[(50-40)÷2+3]

=50-[10÷2+3]

=50-[5+3]

=50-8

=42

e,10-[(64-48).5+(8×10+8)]÷28

=10-[16.5+(80+8)]÷28

=10-[80+88]÷28

=10-168÷28

=10-6

=4

( bạn tự viết đầu bài nhé)

a,47-[(45×16-25×12):14]

=47-[(720-300):14]

=47-[420:14]

=47-30

=17

b,50-[(20-8):2+34]

=50-[12:2+34]

=50-[6+34]

=50-40

=10

c,100-[60:(5^2-15)]

=100-[60÷(25-15)]

=100-[60÷10]

=100-6

=94

d,50-[(50-8×5)÷2+3]

=50-[(50-40)÷2+3]

=50-[10÷2+3]

=50-[5+3]

=50-8

=42

e,10-[(64-48).5+(8×10+8)]÷28

=10-[16.5+(80+8)]÷28

=10-[80+88]÷28

=10-168÷28

=10-6

=4

A) 150-[10²-(14-11)² .2021⁰

=150-[10²-3².2021⁰  ]

=150-[100-9.1]

=150-91

= 59