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)=
=(5×17)+100:10
=85+100:10
=85+10=95
e) 5×[3600:30-81:(54:6)]=
=5×(3600:30-81:9)=5×(120-9)=5×111=555
f) 128:4+[2×(2222:22-22:22)]:10=
=128:4+[2×(101-1)]:10=128:4+(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=-4