a: 12+18+24+36+42+48

=30+60+90

=90+90

=180

b: 327-16+216-27+500

=(327-27)+(216-16)+500

=300+200+500

=1000

c: \(385\cdot485+386\cdot515\)

\(=385\cdot485+385\cdot515+515\)

\(=385\cdot1000+515=385000+515=385515\)

d: \(16\cdot48+8\cdot48+16\cdot28\)

\(=16\cdot\left(48+28\right)+8\cdot2\cdot24\)

\(=16\cdot\left(76+24\right)=16\cdot100=1600\)

e: \(2\cdot4\cdot8\cdot50\cdot25\cdot125=4\cdot25\cdot8\cdot125\cdot2\cdot50\)

\(=100\cdot100\cdot1000=10000000\)

g: \(17\cdot8+51\cdot4=17\cdot4\cdot\left(2+3\right)=17\cdot4\cdot5=17\cdot20=340\)

Bài làm

16x - 14x - x = 2

x ( 16 - 14 - 1 ) = 2

x . 1 = 2

x       = 2

Vậy x = 2

# Học tốt #

\(16\cdot X-14\cdot X-X=2\)

=> \(\left(16-14\right)\cdot X-X=2\)

=>\(2\cdot X-X=2\)

=> \(X=2\)

#CHÚC BẠN HỌC TỐT

giúp mik với

a) x\(\in\){1;2;3;4;6;12}
b) x\(\in\){4;8;16}

không ai làm nhỉ

\(-2x-\left(x-17\right)=34-\left(-x+25\right)\)

\(-2x-x+17=34+x-25\)

\(-2x-x-x=34-25-17\)

\(-4x=-8\Leftrightarrow x=2\)

\(17x-\left(16x-37\right)=2x+43\)

\(17x-16x+37=2x+43\)

\(17x-16x-2x=-37+43\)

\(-x=6\Leftrightarrow x=6\)

\(-2x-3\left(x+17\right)=34-2\left(-x+25\right)\)

\(-2x-3x-51=34+2x-50\)

\(-2x-3x-2x=34-50+51\)

\(-7x=35\Leftrightarrow x=-5\)

ngu

\(3x+36=-7x-64\)

\(10x=-100\)

\(x=-10\)

\(-5x-178=14x+145\)

\(-19x=323\)

\(x=-17\)

b) 1084+(942-2x):16.14=1434

=>(942-2x):36.14=1434-1084

=>(942-2x):36.14=350

=>(942-2x):36=350:14

=>(942-2x):36=25

=>942-2x=25.36

=>942-2x=900

=>2x=942-900

=>2x=42

=>x=42:2

=>x=21

a) 14x+27x+13x=3888

=>(14+27+13)x=3888

=>54x=3888

=>x=3888:54

=>x=72

\(\left(-48\right)\cdot72+36\left(-304\right)\)

\(=36\left(-48\cdot2-304\right)\)

\(=36\cdot\left(-400\right)\)

\(=-14400\)

\(48\left(-21\right)-142\left(-24\right)\)

\(=24\left[2\left(-21\right)+142\right]\)

\(=24\cdot100\)

\(=2400\)