lớp 5 hc số âm r à :D?

33,5x(102-2)=33,5x100=3350

33,5x(102-2)=33,5x100=3350

12,22x(99,7+0,3)=12,22x100=1222

4,2x(18,32-8,32)=4,2x10=42

33,5x(102-2)=33,5x100=3350

33,5x(102-2)=33,5x100=3350

12,22x(99,7+0,3)=12,22x100=1222

4,2x(18,32-8,32)=4,2x10=42

`33,5xx102-33,5xx2=33,5xx(102-2)=33,5xx100=3350`

`33,5xx102-2xx33,5=33,5xx(102-2)=33,5xx100=3350`

`12,12xx99,7+12,12xx0,3=12,12xx(99,7+0,3)=12,12xx100=1212`

`18,32xx4,2-4,2xx8,32=4,2xx(18,32-8,32)=4,2xx10=42`

85000 : 1000 + 18 x 102 = 85 + 1836

                                        =    1921

tink nhé

=456 : (2 x 18 + 3 x 102)

=456 : (36 + 306)

=456 : 342

=1.333333333333333

456 : ( 2 . 18 + 3 . 102)

456 : 342

456:(18x2+102x3)

=456:(36+306)

=456:342

=1.333333333333333

a) 68 + 95 + 32 + 5 = (68 + 32) + (95 + 5) = 100 + 100 = 200

b) 102 + 7 + 243 + 98 = (102 + 98) + (7 + 243) = 200 + 250 = 450

a 68 + 95 + 32 + 5

=( 68 + 32 ) + ( 95 + 5 )

`a) 5 / 13 xx 4 / 15 xx 13 = [ 5 xx 4 xx 13 ] / [ 13 xx 5 xx 3 ] = 4 / 3`

`b) ( 3 / 7 + 5 / 2 ) xx 7 / 5 = 3 / 7 xx 7 / 5 + 5 / 2 xx 7 / 5 = 3 / 5 + 7 / 2 = 6 / 10 + 35 / 10 = 41 / 10`

`c) 1 / 5 xx 11 / 18 + 11 / 18 xx 3 / 5 = 11 / 18 xx ( 1 / 5 + 3 / 5 ) = 11 / 18 xx 4 / 5 = [ 11 xx 2 xx 2 ] / [ 2 xx 9 xx 5 ] = 22 / 45`

\(a,\dfrac{5}{13}\times\dfrac{4}{15}\times13=\dfrac{4}{3}\)

\(b,\left(\dfrac{3}{7}+\dfrac{5}{2}\right)\times\dfrac{7}{5}=\left(\dfrac{6}{14}+\dfrac{35}{14}\right)\times\dfrac{7}{5}=\dfrac{41}{14}\times\dfrac{7}{15}=\dfrac{41}{30}\)

\(c,\dfrac{1}{5}\times\dfrac{11}{18}+\dfrac{11}{18}\times\dfrac{3}{5}=\dfrac{11}{18}\times\left(\dfrac{1}{5}+\dfrac{3}{5}\right)=\dfrac{11}{18}\times\dfrac{4}{5}=\dfrac{22}{45}\)

103*99=10197

143*102=14586

103*99=10197

143*102=14586

tính nhanh mà

24.25+102.94-94-94

=4.25.6+94.(102-1-1)

=100.6+94.100

=100.(6+94)

=100.100

=10000

HT

dấu nhân là chữ x thường nha

a )   u 1   =   3 ,   q   =   2     b )   n   =   10     c )   n   =   13