cái này lớp 6 chưa học mà lớp 5 học là siêu đó

lớp mk lớp chọn mà

kinh day k minh nha

=15 nhé

=15 nhé bạn

15 nhé 

15×2121/4343+15×222222/434343
= 15 x (21x101)/(101x43) + 15x(22x 10101)/(43x10101)
= 15 x 21/43 + 15 x 22/43
= 15x(21/43 + 22/43)
= 15x1 = 15

=15 nha

Đáp án 15

15

\(=15x\left(\dfrac{21}{43}+\dfrac{22}{43}\right)=15x1=15\)

15 nhé bạn

b. 16×25+44×100/ 29×96+142×48

=400+4×11×100/29×96+71×2×48

=400+400×11/29×96+71×96

=400×(1+11)/96×(29+71)

=400×12/96×100=1/2

`a)2018xx(1/2+1212/2424)`

`=2018xx(1/2+1/2)`

`=2018xx2/2=2018`

______________________________

`b)15xx2121/4343+15xx222222/434343`

`=15xx(2121/4343+222222/434343)`

`=15xx(21/43+22/43)`

`=15xx43/43=15`

a.2018x1=2018

b.15x(21/43+22/43)=15x1=15

A)2018

B)15

\(15x\frac{2121}{4343}+15x\frac{222222}{434343}\)

\(=15x\frac{21}{43}+15x\frac{22}{43}\)

\(=15x\left(\frac{21}{43}+\frac{22}{43}\right)\)

\(=15x1\)

\(=15\)

= 15 x 21/43 + 15x 22/43

= 15 x (21/43 + 22/43)

= 15 x 1 =15

\(15\cdot\frac{2121}{4343}+15\cdot\frac{222222}{434343}\) =\(15\cdot\left(\frac{2121}{4343}+\frac{222222}{434343}\right)\) =\(15\cdot\left(\frac{21}{43}+\frac{22}{43}\right)\)  =\(15\cdot\frac{43}{43}\) =\(15\cdot1=15\)   tish cho mk nhé                                                                                                                              

\(a,=15\left(\dfrac{2121}{4343}+\dfrac{222222}{434343}\right)=15\left(\dfrac{21}{43}+\dfrac{22}{43}\right)=15\cdot1=15\)