(36 + 54) × 7 + 7 × 9 + 7

= 90 × 7 + 7 × 9 + 7

= (90 + 9 + 1 ) × 7

= 100 × 7

= 700

(36 + 54) x 7 + 7 x 9 + 7

= 90 x 7 + 7 x 9 + 7

= (90 + 9 + 1 ) x 7

= 100 x 7

= 700

(36 + 54) x 7 + 7 x 9 + 7

= 90 x 7 + 7 x 9 + 7

= (90 + 9 + 1 ) x 7

= 100 x 7

= 700

( 36 + 54 ) x 7 + 7 x 9 + 7

= 90 x 7 + 7 x 9 + 7 x 1

= ( 90 + 9 + 1 ) x 7

= 100 x 7

= 700

Học tốt nhé bạn ~

(36 + 54) x 7+7 x 9+7 =70 x 7+ 7 x 9 +7

                                  =7 x (90 + 9 + 1)

                                  =7 x 100

                                 =700

( 36 + 54 ) x 7 + 7 x 9 + 7

= 90 x 7 + 7 x 9 + 7 x 1

= ( 90 + 9 + 1 ) x 7

= 100 x 7

= 700

(36 + 54) × 7 + 7 × 9 + 7

= 90 × 7 + 7 × 9 + 7

= (90 + 9 + 1 ) × 7

= 100 × 7

= 700

A = 700

a)7.(90+9+1)

=7.100

=700

b)3/4.(3/9+2/3)

=3/4.1

=3/4

a) ( 36 + 54 ) x 7 + 7 x 9 + 7

= ( 36 + 54 + 9 + 1 ) x 7

= 100 x 7

= 700

b) \(\frac{3}{4}\times\frac{3}{9}+\frac{3}{4}\times\frac{2}{3}\)

\(=\left(\frac{3}{9}+\frac{2}{3}\right)\times\frac{3}{4}\)

\(=1\times\frac{3}{4}\)

\(=\frac{3}{4}\)

\(a,=100.7+7.9+7.1\)

\(=\left(100+9+1\right).7\)

\(=110.7\)

\(=770\)

\(b,=\frac{3}{4}.\left(\frac{3}{9}+\frac{2}{3}\right)\)

\(=\frac{3}{4}.1\)

\(=\frac{3}{4}\)

Dấu \(.\)là dấu nhân nha!!!

42x45/5x7=7x6x9x5/5x7=7x6x9x5/5x7=6x9=42

5,4:0,4x225+4,5x775x3