= 33

= 69

= 69

= 91

= 59

= 69

= 98

= 70

= 95

= 100

21+12=33

56+13=69

59+10=69

50+41=91

19+40=59

57+12=69

90+8=98

50+20=70

72+23=95

50+50=100

21+12= 33

56+13=69

59+10=69

50+41=91

19+40=59

57+12=69

90+8=98

50+20=70

72+23=95

50+50=100

Dễ vầy  mà cũng hỏi

12+13=35-10

40+50=100-10

12+13 =35 - x

25      = 35 - x

x        = 35 - 25

x       =10

40 + 50 = 100 -x

90         = 100 - x

x           =100-90

x          =10

12 + 13 = 35 - x

25         = 35 - x

x           = 35 - 25

x           = 10

40 + 50 = 100 - x

90         = 100 - x

x           = 100 - 90

x           = 10

\(=240+390+560+750=1940\)

b) 12 x 20 + 13 x 30 + 14 x 40 + 15 x 50

=(12x20) x (13x30) + (14x40) x (15x50)

=1940

a, 1+2+3+4+5+6+7+8+9=

(1+9)+(2+8)+(3+7)+(4+6)+5

=10+10+10+10+5

=45

b,(12+8)+(13+7)

=20+20

=40

c,(50+50)+(60+40)

=100+100

=200

(1+2+3+4+5+6+7+8+9)=45

12+13+7+8=40

50+60+50+40=200

45 đó

40 nha

200 đó

60căn210

1/2×(2×x-3)+105/2=-137/2

1/2×(2×x-3)=-137/2-105/2

1/2×(2×x-3)=-242/2

2×x-3=-242/2:1/2

2×x-3=-242

2.x=(-242)+3

2.x=239

x=239:2

x=239/2

A,-12×25-25×75-25×13

=[(-12)-75-13].25

=(-100).25

-2500

B,-50/7×49/10-35/2×-10/7+ -25/3× -9/5

=(-35)-(-25)+(-13)

=-23

C,-354+265-156+125

=[(-354)-156]+(265+125)

=(-510)+277

=-233

D,-74+40-50+16-35

=(-74)+40+(-50)+16+(-35)

=[(-74)+(-35)]+[40+(-50)+16]

=(-109)+26

=-83

E,-2/3×4/5+-4/5×4/3-0,125

=-2/3.4/5+4/5.(-4/3)-0,125

=4/5.[-2/3+(-4/3)]-0,125

=4/5.(-2)-0,125

=-8/5-0,125

=(-1,6)+(-0,125)

=-1,725

a) \(\left(-23\right)+13\left(-17\right)+57\)

\(=\left(-23\right)+\left(-221\right)+57\)

\(=-23-221+57\)

\(=-\left(23+221\right)+57\)

\(=-244+57\)

\(=-\left(244-57\right)\)

\(=-187\)

b) \(\left(-26\right)+\left(-6\right)+\left(-75\right)+\left(-50\right)\)

\(=-26-6-75-50\)

\(=-\left(26+6\right)-75-50\)

\(=-32-75-50\)

\(=-\left(32+75\right)-50\)

\(=-107-50\)

\(=-\left(107+50\right)\)

\(=-157\)

c) \(14+6+\left(-9\right)+\left(-14\right)\)

\(=14+6-9-14\)

\(=20-9-14\)

\(=11-14\)

\(=-3\)

d) \(\left(-123\right)+\left|13\right|+\left(-7\right)\)

\(=-123+13-7\)

\(=-\left(123-13\right)-7\)

\(=-110-7\)

\(=-\left(110+7\right)\)

\(=-117\)

e) \(\left|0\right|+\left|45\right|+\left(-\left|-455\right|\right)+\left|-796\right|\)

\(=0+45+\left(-455\right)-796\)

\(=45-455-796\)

\(=-410-796\)

\(=-\left(410+796\right)\)

\(=-1206\)

f) \(-\left|-33\right|+\left(-12\right)+18+\left|45-40\right|-57\)

\(=-33-12+18+\left|5\right|-57\)

\(=-\left(33+12\right)+18+5-57\)

\(=-45+18+5-57\)

\(=-\left(45-18\right)+5-57\)

\(=-27+5-57\)

\(=-\left(27-5\right)-57\)

\(=-22-57\)

\(=-\left(22+57\right)\)

\(=-79\)

(-23)+13(-17)+57

=(-23)-221+57

=218+57

=275

14+6+(-9)+(-14)

=20+(-9)+(-14)

=11+(-14)

=-3