Lời giải:

a. $95+43-55+43-95+33=(95-95)+(43+43+33)-55$

$=119-55=64$

b. $146+989+134+221+91+33=(146+134)+(989+91)+221+33$

$=280+1080+252=1612$

B

b

134 x 100 + 250 x 100 – 84 x100.

= 100 x (134 + 250 – 84)

= 100 x 300

= 30 000

1

x-160:5=785

x-32     =785

x          =785+32

x          =817

còn bài 2 nữa

999 - x + 500 = 124

999 - x = 124 - 500

999 - x = -376

x = 999 + 376

x = 1375

x + 134 - 160 = 308

x + 134 = 308 + 160

x + 134 = 468

x = 468 - 134

x = 334

a) \(999-x+500=124\)

\(\Rightarrow999-x=124-500\)

\(\Rightarrow999-x=-376\)

\(\Rightarrow x=999-\left(-376\right)\)

\(\Rightarrow x=999+376\)

\(\Rightarrow x=1375\)

b) \(x+134-160=308\)

\(\Rightarrow x+134=308+160\)

\(\Rightarrow x+134=468\)

\(\Rightarrow x=468-134\)

\(\Rightarrow x=334\)

mình chịu thôi

các bạn đừng nhìn thấy phép tính dài mà nản

134 x 100 + 250 x 100 - 84 x 100

= (134 + 250 - 84 ) x 100

= ( 384 - 84 0 x 100

= 300 x 100

= 30000

a, 13104

b,134*100+250*100-84*100=100*(134+250-84)=100*300=30000

a. 64 x 50 + 44 x 100

= 32 x 2 x 50 + 44 x 100

= 32 x 100 + 44 x 100

= (32 + 44) x 100

= 76 x 100

= 7600

b. 27 x 38 + 146 x 19

= 27 x 38 + 73 x 19 x 2

= 27 x 38 + 73 x 38

= (27 + 73) x 38

= 100 x 38

= 3800

a/b = 7600/3800 = 2

\(64\times50+44\times100\)

\(=32\times2\times50+44\times100\)

\(=\left(32+44\right)\times100\)

\(=76\times100=7600\)

   134 x 27 + 636 x 134 + 134 x 324 + 134 

= 134 x ( 27 + 636 + 324 + 1)

= 134 x 988

=132392