Question

ex 11 pag 72 culegere de matematica clasa 4 va rog​

Answer 1

Răspuns:

a) (36:a+63:9):2=8 36:a=16-7 a=36:9

(36:a+7)=8x2

36:8-9

a=4

b) b+149+[(72:8+28:4):4=396

b+149+(9+7):4=396

b+149+16:4-396

b+149+4=396 b=396-153

b+153=396

b=243

c) 93-85-9×9+5x8)-c=5×6+1

93-(85-81+40)-c=30+1

93-44-c-31 49-c-31

c-49-31

c=18

d) (242+360:10-214):(80:5-4x2)xd=1000

(242+36-214):(16-8)xd=1000 64:8xd=1000

8d=1000

d=1000:8

d=125

e) 94+[(402:2+5xe)x2+8]:5-184 [(201+5xe)x2+8]:5=184-94

[(201+5xe)*2+8]=90x5

(201+5xe)×2+8=450

(201+5xe)*2=450-8

(201+5xe)x2=442

201+5xe=442:2

201+5xe=221

5xe=221-201

5xe=20

e=20:5

e=4

f) 500-[(16×18-192:f):7+14x5+10]:4×7+5=299

[(16x18-192:f):7+14x5+10]:4x7+5=500-299 [(288-192:f):7+70+10]:4x7+5=201

[(288-192:f):7+80]:4x7=201-5

[(288-192:f):7+80]:4x7=196 [(288-192:f):7+80]:4=196:7

[(288-192:f):7+80]:4=28

[(288-192:f):7+80]=28x4

(288-192:f):7+80=112

(288-192:f):7-112-80

(288-192:f):7-32

288-192:f=32x7

288-192:f=224

192:f-288-224

192:f=64

f-192:64

f=3

g) 6+[15-(8:ax7+7)]×5=8:(1×4)+3×3 6+[15-(8:ax7+7)]*5=8:4+9

6+[15-(8:ax7+7)]x5=2+9 6+[15-(8:ax7+7)]×5=11

[15-(8:ax7+7)]×5-11-6

[15-(8:ax7+7)]*5=5 [15-(8:ax7+7)]=5:5

15-(8:ax7+7)=1

(8:ax7+7)=15-1

8:ax7+7=14

8:ax7=14-7

8:ax7=7

8:a=1

a=8

h)4+4x[4+4x(4+h:4)+4]:4=52

4x[4+4x(4+h:4)+4]:4=52-4

4x[4+4x(4+h:4)+4]:4=48

4+4x(4+h:4)+4=48

4x(4+h:4)=48-8

4x(4+h:4)=40

4+h:4=40:4

4+h:4=10

h:4-10-4

h:4-6

h=24

i)834-[(6×137-364:1):7+139]:3-751

834-[(822-364:1):7+139]:3=751

[(822-364:1):7+139]:3-834-751

[(822-364:1):7+139]:3=83

[(822-364:1):7+139)=83x3 (822-364:1):7+139=249

(822-364:1):7-249-139

(822-364:1):7-110

822-364:1-110x7 822-364:1-770

364:1-822-770

364:1-52

i=364:52

i=7

j)234+[(88:4+i)-78:6]x23=809 (22+1-13)×23-809-234

(i+9)x23=575

i+9=575:23

i+9=25

i=25-9

i=16