109,5-67,23-9,5

=(109,5-9,5)-67,23

=100-67,23

=32,77

= (109,5-9,5)-67,23

\(7,568\times99+7,568=7,568\times\left(99+1\right)=7,568\times100=756,8\)

\(34,89\times97+34,89:0,5+34,89\)

\(=34,89\times97+34,89\times2+34,89\)

\(=34,89\times\left(97+2+1\right)\)

\(=34,89\times100=3489\)

7,568×99+7,568

=7,568×99+7,568x1

=7,568×(99+1)

=7,568×100=756,8

34,89×97+34,89:0,5+34,89

=34,89×97+34,89x2+34,89x1

=34,89×(97+2+1)

=34,89×100

=3489

Tính nhanh

198,67 - 34,89 - 98,67 = 65,11

Đ/S : 65, 11

tk cho mk nha cảm ơn ran shibuki

198,67 - 34,89 - 98,67 = 65,11

198,67 - 34,89 - 98,67

= ( 189,67 - 98,67 ) - 34,89

= 100 - 34,89

= 65,11

k mk mk k lại 

\(198,67-34,89-98,67\)

\(=\left(198,67-98,67\right)-34,89\)

\(=100-34,89\)

\(=65,11\)

189,67 - 34,89 - 89,67

= ( 189,67 - 89,67 ) - 34,89

= 100 - 34,89

= 65,11

k mk mk k lại 

189,67-34,89-89,67

=(189,67-89,67)-67,34

=100-67,34

=32,66

46619.56

 nhanh nhat nek

= 46619,56

~~học tốt~~

= 67,23 x 8 - 67,23 x 2,5 x 2 - 67,23 x 2

=67,23 x 8 - 67,23 x 5 - 67,23 x 2

=67,23 x (8 - 5 - 2)

=67,23 x 1

=67,23

= 67,23 x 8 - 67,23 x 2,5 x 2 - 67,23 x 2

=67,23 x 8 - 67,23 x 5 - 67,23 x 2

=67,23 x (8 - 5 - 2)

=67,23 x 1

=67,23

câu 1 S

câu 2 S

câu 3 Đ

câu 4 Đ

1S   2S   3Đ   4Đ     Chúc bạn học tốt!!^^

1)

 25 x 7 + 3 x (50-25) x (60 - 60)

=175 +3 x 25 x 0

=175

2)

\(\frac{1}{2}.\frac{3}{4}.\frac{4}{5}.\frac{1}{3}\\ =\frac{1.3.4.1}{2.4.5.3}\\ =\frac{3.4}{3.4.2.5}\\ =\frac{1}{2.5}\\ =\frac{1}{10}\)

1:  25 x 7 + 3 x ( 50-25 ) x ( 60-60 )

    = 25 x 7 + 3 x 25 x 0

    = 25 x 7

    = 175

2:  1/2 x 3/4 x 4/5 x 1/3

    = 1/2 ( 3/4 x 4/5 x1/3 )

    = 1/2 x 1/5

    = 1/20