3x=10-1

3x=9

x=9:3

x=3

3x+1=10

3x=10-1

3x=9

x=9:3

x=3

=4.(123+1209+323)

=4.1655

=6620

=6620

k cho mik nhé

= 12

= 15

= 29

9

15

236

[3319-7] chia [10-1]=368

CHỊU?

C1:

Có số bạn là:

550 : 10 = 55 (bạn)

Đ/s: 55 bạn

ko biết?

\(\frac{24}{35}:\frac{3}{4}=\frac{24}{35}\cdot\frac{4}{3}=\frac{96}{105}=\frac{32}{35}\) 

Hk tốt

24/35 : 3/4 =24/35 x 4/3 = 32/35

                                                hok tốt !!!!!!! nha

29+84=103

=113

k nhé 

C1: \(\left(\frac{3}{5}+\frac{4}{9}\right)\cdot\frac{3}{8}=\frac{47}{45}\cdot\frac{3}{8}=\frac{141}{360}=\frac{47}{120}\)

C2: \(\left(\frac{3}{5}+\frac{4}{9}\right)\cdot\frac{3}{8}=\frac{3}{5}\cdot\frac{3}{8}+\frac{4}{9}\cdot\frac{3}{8}=\frac{9}{40}+\frac{12}{72}=\frac{47}{120}\)

C1: ( \(\frac{3}{5}+\frac{4}{9}\) ) * \(\frac{3}{8}\) 

= \(\frac{47}{45}\) * \(\frac{3}{8}\) = \(\frac{47}{120}\) 

C2: Đề

= 3/5 * 3/8 + 4/9 * 3/8

= 9/40 + 1/6

= 47/120

\(18\cdot7+18\cdot16-18\cdot14+18\)

\(=18\cdot\left(7+16-14+1\right)\)

\(=18\cdot10=180\)

\(\text{18 x 7 + 18 x 16 - 18 x 14 + 18}\)

\(=18\times\left(7+16-14+1\right)\)

\(=18\times10=180\)

\(24\cdot8+30\cdot8+46\cdot8-500\)

\(=8\left(24+30+46\right)-500\)

\(=8\cdot100-500\)

\(=800-500=300\)

24x8+30x8+46x8-500

=(24x8+30x8+46x8)-500

=8x(24+30+46)-500

=8x100-500

=800-500

=300