Question

Calculează , respectând regulile pe care le introduc parantezele in calcul. d) [( 9-6)×(8+9 )]+100:(4+6) e) 5×[3600:30-81:(54:6)] f) 128:4+[2×(2222:22-22:22)] :10 g) 36 :9 +4×[20+6×(100:4- -42:2 )] h ) 126-[(63×2:6+109)× (75:25+21:3 )]:10.

Answer 1

d)
[( 9-6)×(8+9 )]+100:(4+6)=
( 3×17 )+100:10=
51+10=
61

e)
5×[3600:30-81:(54:6)] =
5×(120-81:9) =
5×(120-9)=
5×111=
555


f)
128:4+[2×(2222:22-22:22)] :10 =
32+[2×(101-1)] :10 =
32+(2×100):10 =
32+200:10=
32+20=
52


g)
36 :9 +4×[20+6×(100:4-42:2 )] =
4+4×[20+6×(25-21 )] =
4+4×(20+6×4)=
4+4×(20+24)=
4+4×44=
4+176=
180


h )
126-[(63×2:6+109)× (75:25+21:3 )]:10=
126-[(126:6+109)× (3+7 )]:10=
126-[(21+109)× 10]:10=
126-(130× 10):10=
126-1300:10=
126-130=
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