Qui đồng mẫu lên rồi tính.

=4800

= 48 x (27 + 1) + 48 x 72

= 48 x 28 + 48 x 72

= 48 x (28 + 72)

= 48 x 100 = 4800

48 x 27 + 48 + 96 x 36
= 48 x (27 + 1) + 48 x 72
= 48 x 28 + 48 x 72
= 48 x (28 + 72)
= 48 x 100
= 4800 .

bằng 4800

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A

A

a) \(\Leftrightarrow4x=20\Leftrightarrow x=5\)

b) \(\Leftrightarrow18x-288=27.4+8.9-144\)

\(\Leftrightarrow18x=108+72-144+288=324\)

\(\Leftrightarrow x=18\)

c)Ta có:

\(x\in B\left(6\right)\) và \(22< x\le36\)

mà \(B\left(6\right)=\left\{0;6;12;18;24;30;36;42;48;...\right\}\)

\(\Rightarrow x\in\left\{0;6;12;18;24;30;36;42;48;...\right\}\) và \(22< x\le36\)

\(\Rightarrow x\in\left\{24;30;36\right\}\)

Vậy \(x\in\left\{24;30;36\right\}\)

Ta có: \(72\cdot26+36\cdot48\)

\(=36\cdot2\cdot26+36\cdot48\)

\(=36\cdot52+36\cdot48\)

\(=36\cdot\left(52+48\right)\)

\(=36\cdot100=3600\)

có sai đề ko ạ?

Sửa đề:
\(72\times26+26\times28\)
\(=\left(72+28\right)\times26\)
\(=100\times26\)
\(=2600\)

\(72\times26+36\times48=72\times26+26\times48+480=26\times\left(72+48\right)+480=26\times120+480=26\times120+120\times4=120\times\left(26+4\right)=120\times30=3600\)