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!!!
Câu a mình nhìn nhầm nha, Sorry!!!
Ta có :
a, 7 x (36 + 54 + 9 + 1)
= 7 x 100
= 700
b, \(\frac{3}{4}\)x \(\frac{3}{9}\)+ \(\frac{3}{4}\)x \(\frac{2}{3}\)
= \(\frac{3}{4}\)x (\(\frac{3}{9}\)+ \(\frac{2}{3}\))
= \(\frac{3}{4}\)x 1
= \(\frac{3}{4}\)
a) (36+54) x7+7x9+7=100x7+7x9+7
=100x7+7x9+7x1
=7x(100+9+1)
=7x110
=770
b)3/4 x 3/9 + 3/4 x 2/3=3/4x(3/9+2/3)
=3/4x(3/9+6/9)
=3/4x9/9(1)
=3/4x1=3/4
học tốt nhé
Mk lm đúng mà câu a ý mk thấy còn có vài bạn lm sai mà có ai t.i.c.k mk sai thế, nghiệp lắm ạ !
a,( 36 + 54 ) x 7 + 7 x 9 +7 = 90 x 7 + 7 x 9 + 7
= 90 x 7 x 9 x 7 x 1
= 90 x [7 x (9+ 1)]
= 90 x 70
= 6300
a) (36 + 54) x7 +7 x9 +7= 90x 7+ 9x7 +1x7
=(90+9+1)x7
=100x7
=700
b) 3/4 x 3/9 + 3/4 x 2/3= 3/4 x (3/9 + 2/3)
= 0,75 x 1
= 0,75
