\(\text{-204 + 84 : 2}\)

\(=-204+42\)

\(=-162\)

\(\text{792-24.(-2) + (-692) + (-26).(-2) }\)

\(=\left[792+\left(-692\right)\right]+\left(-2\right).\left(-24-26\right)\)

\(=100+\left(-2\right).\left(-50\right)\)

\(=-100+100=0\)

chúc bạn học tốt

\(-204+84:2\)

\(=-204+42\)

\(=-162\)

a)-204+84:2

=-204+42

=-162

b)

Lời giải:

$A=16-18+20-22+24-26+...+64-66+68$

$=\underbrace{(16+20+24+...+64+68)}_{M}-\underbrace{(18+22+26+...+66)}_{N}$

M có số số hạng là:

$(68-16):4+1=14$

Giá trị $M$ là: $(68+16)\times 14:2=588$

N có số số hạng là:

$(66-18):4+1=13$

Giá trị N là: $(66+18)\times 13:2=546$

$A=M-N=588-546=42$

bang 3624 ban nha

3624 nhé bạn

692 + 152 - 92

= (692 - 92) + 152

= 600 + 152

752

Tính nhanh 692+152−92

692+152−92=(692−92)+152=600+152=752 ( Đúng )

\(692+152-92=692-92-152=600-152=752\)( Sai )

16-18+20-22+24-26+28-....-62+64-66+68

 = 16 +(20-18) + (24-22) + ( 28-26 ) +........+ (68-66)

 = 16 +2+2+2+.....+2

 = 16 + 2.26

 = 68

-3/7+15/26-(2/13-3/7)

= -3/7+15/26-2/13+-3/7

= -(3/7+ -3/7)+(15/26-2/13)

= 0 +11/26

= 11/26

mơm bạn nha

=\(\dfrac{1.\left(-1\right).\left(-3\right).\left(-2\right)}{1.2.1.2}\)

\(=\dfrac{-6}{4}\)

\(=-\dfrac{3}{4}\)

\(\dfrac{1}{4}+\dfrac{1}{3}\times X=\dfrac{1}{2}\\ \dfrac{1}{3}\times X=\dfrac{1}{2}-\dfrac{1}{4}=\dfrac{1}{4}\\ X=\dfrac{1}{4}:\dfrac{1}{3}=\dfrac{1}{4}\times3=\dfrac{3}{4}\)

$\genfrac{}{}{0ex}{}{1}{4}+\genfrac{}{}{0ex}{}{1}{3}\times X=\genfrac{}{}{0ex}{}{1}{2}\genfrac{}{}{0ex}{}{1}{3}\times X=\genfrac{}{}{0ex}{}{1}{2}-\genfrac{}{}{0ex}{}{1}{4}=\genfrac{}{}{0ex}{}{1}{4}X=\genfrac{}{}{0ex}{}{1}{4}:\genfrac{}{}{0ex}{}{1}{3}=\genfrac{}{}{0ex}{}{1}{4}\times 3=\genfrac{}{}{0ex}{}{3}{4}$