Calculează:
a) 3+3×[3+3:3×(3+3×3) ] : 15
b) 812-4×[61-3600:12:30) ] : 9
c) [214+240:(16-2×5)]×25-25:25
d) 90+7×[1614-12000:(18-10)]-16
e) 44+8×[280:(37-1480:20:37)]:32-7
f) (18×8+56):[50×40:(220-2×60)]
Vă rog ajutațimă,dau coroană vă implor!!
Răspunsuri la întrebare
Răspuns:
Explicație pas cu pas:
a)
3 + 3 × [ 3 + 3 : 3 × ( 3 + 3 × 3 ) ] : 15 = 6
= 3 + 3 × [ 3 + 1 × ( 3 + 9 ) ] : 15 =
= 3 + 3 × ( 3 + 1 × 12 ) : 15 =
= 3 + 3 × 15 : 15 =
= 3 + 45 : 15 =
= 3 + 3 =
= 6
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b)
812 - 4 × [ 61 - 3600 : 12 : 30 ) ] : 9 → exercitiu incomplet ( lipseste paranteza rotunda deschisa!
812 - 4 × [ 6 × ( 61 - 3 600 : 12 : 30) ] : 9 = → exercitiu corect
= 812 - 4 × [ 6 × ( 61 - 300 : 30 ) ] : 9 =
= 812 - 4 × [ 6 × ( 61 - 10 ) ] : 9 =
= 812 - 4 × ( 6 × 51 ) : 9 =
= 812 - 4 × 306 : 9 =
= 812 - 1224 : 9 =
= 812 - 136 =
= 676
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c)
[ 214 + 240 : ( 16 - 2 × 5 ) ] × 25 - 25 : 25 = 6 349
= [ 214 + 240 : ( 16 - 10 ) ] × 25 - 1 =
= ( 214 + 240 : 6 ) × 25 - 1 =
= ( 214 + 40 ) × 25 - 1 =
= 254 × 25 - 1 =
= 6 350 - 1 =
= 6 349
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d)
90 + 7 × [ 1614 - 12 000 : ( 18 - 10) ] - 16 = 872
= 90 + 7 × ( 1614 - 12 000 : 8 ) - 16 =
= 90 + 7 × ( 1614 - 1 500 ) - 16 =
= 90 + 7 × 114 - 16 =
= 90 + 798 - 16 =
= 888 - 16 =
= 872
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e)
44 + 8 × [ 280 : ( 37 - 1480 : 20 : 37 ) ] : 32 - 7 = 39
= 44 + 8 × [ 280 : ( 37 - 74 : 37 ) ] : 32 - 7 =
= 44 + 8 × [ 280 : ( 37 - 2 ) ] : 32 - 7 =
= 44 + 8 × ( 280 : 35 ) : 32 - 7 =
= 44 + 8 × 8 : 32 - 7 =
= 44 + 64 : 32 - 7 =
= 44 + 2 - 7 =
= 46 - 7 =
= 39
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f)
( 18 × 8 + 56 ) : [ 50 × 40 : ( 220 - 2 × 60 ) ] = 10
= ( 144 + 56 ) : [ 2000 : ( 220 - 120 ) ] =
= 200 : ( 2000 : 100 ) =
= 200 : 20 =
= 10