Matematică, întrebare adresată de gabriel86, 9 ani în urmă

"Alfabet...matematic:i)(47+7):i=28:4+42:6-35:7;j)(6×5+4×j-8):6=28:4;k)(8×8-32-12:k)-(40-2×10)=3×3;l)(95-9×5-9×l):8=9×4-8×4;m)(9×9-m-8×4):7=2×2;n)(9×7+n-5×8)-5×5+70=75;o)(87-9×4-o)-5×5+10÷2=5×2-0÷4×7;p)93-(85-9×9+5×8)-p=5×6+1;r)(5×5+6×6-r)+6×5-5×10=9÷3

Răspunsuri la întrebare

Răspuns de predaen
228
i)(47+7):i=28:4+42:6-35:7
54:i=7+7-5
54:i=9
i=54:9
i=6

j)(6×5+4×j-8):6=28:4
(30+4×j-8):6=7
30+4×j-8=7x6
4xj+22=42
4xj=42-22
4xj=20
j=20:4
j=5

k)(8×8-32-12:k)-(40-2×10)=3×3
(64-32-12:k)-(40-20)=9
(32-12:k)-20=9
32-12:k=9+20
32-12:k=29
12:k=32-29
12:k=3
k=12:3
k=4

l)(95-9×5-9×l):8=9×4-8×4
(95-45-9×l):8=36-32
(50-
9×l):8=4
50-9×l=4x8
50-9×l=32
9×l=50-32
9×l=18
l=18:9
l=2

m)(9×9-m-8×4):7=2×2
(81-m-32):7=4
49-m=4x7
49-m=28
m=49-28
m=21

n)(9×7+n-5×8)-5×5+70=75
(63+n-40)-25+70=75
23+n=75-70+25
23+n=30
n=30-23
n=7

o)(87-9×4-o)-5×5+10÷2=5×2-0÷4×7
(87-36-o)-25+5=10
51-o-25+5=10
31-o=10
o=31-10
o=21

p)93-(85-9×9+5×8)-p=5×6+1
93-(85-81+40)-p=30+1
93-44-p=31
49-p=31
p=49-31
p=18

r)(5×5+6×6-r)+6×5-5×10=9÷3
(25+36-r)+30-50=3
61-r+30=3+50
91-r=53
r=91-53
r=38
Alte întrebări interesante