=>x/100=50

hay x=5000

10000+ 100 - 50 +350 - 400= 1000

tui nhanh tay k tui

1000 + 100 - 50 + 350 - 400

= 1100 - 50 + 350 - 400

=  1050 + 350 - 400

=  1400 - 400

= 1000

a) 350 : 50 = 7

240 : 30 = 8

b) 2400 : 60 = 40

6300 : 70 = 90

Tính giá trị của các biểu thức sau:

a) 250 – 550 : 5

= 250 - 110

= 140 

b) 350 : 7 – 6

= 50 - 6

= 44 

c) 450 – (50 + 350)

= 450 - 400

= 50

d) (500 + 40) x 2

= 540 x 2

= 1080

50+100+150+200+250+300+350+400+450

=(50+450)+(100+400)+(200+300)(150+350)+250

=500+500+500+500+250

=500x4+250

=2000+250

=2250

Chúc bạn học giỏi nha

K cho mik vs nhé

50 + 100 + 150 + 200 + 250 + 300 + 350 + 400 + 450

= ( 50 + 450 ) + (100 + 400 ) + ( 150 + 350 ) + ( 200 + 300 ) + 250

=       100       +      100         +       100       +       100          + 250

=                                         400                                         + 250

= 650

CHÚC BẠN HỌC TỐT NHÉ !

a) 72 + 20 = 92

68 – 40 = 28

350 + 30= 380

970 – 70 = 900

b) 411 + 300 = 7811

625 + 200 = 825

954 – 400 = 554

367 – 300 =67

c) 32 + 7 + 8 = (32+8)+7=40+7=47

54 + 7 + 3 = 54 + (7+3)= 54+10=64

1 + 16 + 9 = (1+9)+16=10+16=26

96 + 40 + 4 = (96+4)+40=100+40=140

a) 500 + 400 = 900

900 – 400 = 500

900 – 500 = 400

b) 700 + 50 = 750

750 – 50 = 700

750 – 700 = 50

c) 300 + 40 + 6 = 346

300 + 40 = 340

300 + 6 = 306

a) 500+400=900

    900-400=500

    900-500=400

b) 700+50=750

    750-50=700

    750-700=50

c) 300+40+6=346

    300+40=340

    300+6=306

\(g,101+\left(-60\right)+29+\left(-40\right)=41+29+\left(-40\right)=70+\left(-40\right)=30\)

\(h,167+\left(-252\right)+52+\left(-67\right)=\left(-85\right)+52+\left(-67\right)=\left(-33\right)+\left(-67\right)=-100\)

\(i,38-138+250-350=\left(-100\right)+250-350=150-350=-200\)

\(k,118+107-\left(118-93\right)-50=225-25-50=100-50=50\)

\(m,40+\left(139-172+99\right)-\left(139+199-172\right)=40+\left[\left(-33\right)+99\right]-\left(338-172\right)\)

\(=40+66-166=106-166=-60\)