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calculati,scotand factor comun.42,a) 42,9ori 3,4+1,6ori 42,9 b) 0,03ori 16,2+0.03ori 2,8-0,03 c) 2ori 1,25+0,3ori 1,25+2,08 ori 1,25 d) 9,16ori 17-3,4ori 17-17+0,24ori 17

Răspuns :

a) 42,9•3,4+1,6•42,9=
=42,9•(3,4+1,6)=
=42,9•5=
=214,5

b) 0,03•16,2+0,03•2,8-0,03=
=0,03•(16,2+2,8)•2,8-0,03=
(simplificăm 0,03 cu 0,03)
=(16,2+2,8)•2,8=
=29•2,8=
=81,2

c) 2•1,25+0,3•1,25+2,08•1,25=
=1,25•(2+0,3+2,08)=
=1,25•4,11=
=5,1375

d) 9,16•17-3,4•17-17+0,24•17=
=17•(9,16-3,4+0,24)-17=
=17•(6,12+0,24)-17=
=17•6,36-17=
=108,12-17=
=91,12

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