( 25 x 8 + 25 x 2 ) × ( 37 x 2 - 75 + 14 )

=(25×[8+2])×13

=250×13

=3250

Chúc em học tốt

Mà cái ngoặc thứ hai là chị làm theo cách cấp 2 , vì 74 ko trừ đc 75

Nếu mà theo các cấp 1 thì coi như đề sai rồi

     ( 25 x 8 + 25 x 2 ) x ( 37 x 2 - 75 + 14 )
=>   25 x ( 8 + 2 )       x (37 + 2 - 14 ) + 75

=>   25 x 10                x 25               + 75

=>   250                      x 100

=>   25000

~Học tốt~

(25x8+25x2)x(37x2-75+14)

= [25x(8+2)]x(37x2-37x2+15)

= [25x(8+2)]x[37x(2-2)+15]

=(25x10)x0+15

=15

(3 * 25 * 8) + (4 * 37 * 6) + (2 * 35 * 12) =

2328

mk chỉ tính ra kết quả là 2328 thôi, lm nhanh thì mk ko bik

\(=\left(\dfrac{3}{4}+\dfrac{1}{4}\right)+\left(-\dfrac{17}{25}-\dfrac{8}{25}\right)+\left(\dfrac{13}{37}+\dfrac{24}{37}\right)=1\)

1

Đổi: 75%=3/4

       25%=1/4

3/4x56+1/2x28-1/4x224

=3/4x56+(1/2:2)x(28x2)-(1/4x4)x(224:4)

=3/4x56+     1/4x    56  -     1     x    56

=(3/4+1/4-1)x56

=   1-1         x56

=     0          x56

=         0.

 75% *56 +1/2 *28-25%*224=0

1/\(\left(-12\right)\cdot46-12\cdot54=\left(-12\right)\cdot46+\left(-12\right)\cdot54\)

\(=\left(-12\right)\cdot\left(46+54\right)=\left(-12\right)\cdot100=-1200\)

2/\(3784+23-3785-15=3785+22-3785-15\)

\(=22-15=7\)

3/\(\left(-8\right)\cdot25\cdot\left(-2\right)\cdot4\cdot\left(-5\right)\cdot125\)

\(=\left[\left(-8\right)\cdot125\right]\cdot\left[25\cdot4\right]\cdot\left[\left(-5\right)\cdot\left(-2\right)\right]\)

\(=\left(-1000\right)\cdot100\cdot10=-1000000\)

4/\(19\cdot25+9\cdot95+19\cdot30=19\cdot\left(25+30\right)+9\cdot95\)

\(=19\cdot55+9\cdot95=95\cdot11+9\cdot95=95\cdot\left(11+9\right)=20\cdot95=1900\)

5/\(\left(-50+19+143\right)-\left(-79+25+48\right)\)

\(=\left(-50\right)+19+143+79-25-48\)

\(=118\)

6/\(\left(-25\right)\cdot\left(75-45\right)-75\cdot\left(45-25\right)\)

\(=\left(-25\right)\cdot30+\left(-25\right)\cdot3\cdot20\)

\(=\left(-25\right)\cdot\left(30+60\right)=\left(-25\right)\cdot90=-2250\)

7/\(\left(-37-17\right)\cdot\left(-9\right)+35\left(-9-11\right)\)

\(=\left(-54\right)\cdot\left(-9\right)+35\cdot\left(-20\right)\)

\(=486+\left(-700\right)=-214\)

8/\(\left(187-23\right)-\left(20-180\right)\)

\(=187-23-20+180=324\)

9/\(512\cdot2-128\cdot\left(-512\right)\)

\(=512\cdot2+128\cdot512=512\cdot\left(2+128\right)\)

\(=512\cdot130=66560\)

10/\(17\cdot\left(-25\right)+25\cdot21\)

\(=17\cdot\left(-25\right)-\left(-25\right)\cdot21=\left(-25\right)\cdot\left(17-21\right)\)

\(=\left(-25\right)\cdot\left(-4\right)=100\)

Chúc bạn học tốt.

1) (-12).46-12.54

=12.(-46)-12.54

=12.(-46-54)

=12.(-100)=(-1200)

10) 17.(-25)+25.21

= (-17).25+25.21

=25.(-17+21)

=25.4=100

( Mik đọc lướt qua thì thấy hai bài này dễ nên làm, chứ mấy bài kia chưa suy nghĩ gì, bạn tự làm nốt nhé!)

2: \(=\left(3784-3785\right)+\left(23-15\right)=\left(-1\right)+8=7\)

3: \(=-8\cdot25\cdot2\cdot4\cdot5\cdot125\)

\(=-8\cdot125\cdot25\cdot4\cdot2\cdot5=-1000\cdot100\cdot10=-1000000\)

4: \(=19\left(25+9\cdot5+30\right)=19\cdot100=1900\)

5: \(=-50+19+143+79-25-48\)

\(=\left(-50-25+79\right)+143+19-48\)

=54+143-29

=143+25=168

6: \(=-25\cdot75+25\cdot45-75\cdot45+75\cdot25\)

\(=45\left(25-75\right)=45\cdot\left(-50\right)=-2250\)

7: \(=-54\cdot\left(-9\right)+35\cdot\left(-20\right)\)

\(=486-700=-214\)

8: \(=187-23-20+180=164+160=324\)

9: \(=512\left(2-128+128\right)=512\cdot2=1024\)

19/4 + 37/100 + 1/8 + 1/2 + 163/4 + 6/25 + 9/25

=( 19/4 + 163/4 )+ 37/100 + (1/8 + 1/2 ) + ( 6/25 + 9/25 )

= 182/4 +37/100+5/8+3/5

=(182/4+37/100+3/5)+5/8

=(4550/100+37/100+60/100)+5/8

=4647/100+5/8

=9419/200