a,8/27+5/15+19/27+11/15
b,1/50+15/50+9/50+25/50
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5) 24*(15+49)+12*(50+42)
=24*64+12*92
=24*64+12*2*46
=24*64+24*46
=24*(64+46)
=24*110
=2640
1+2+3+4+5+6+7+8+9+10=55
11+12+13+14+15+16+17+18+19+20=155
1+2+3+4+5+6+7+8+9+10+11+12+13+14 +15+16+17+18+19+20+21+22+23+24+25+26+27+28+29+30-50-53=362
\(1+2+3+4+5+6+7+8+9+10=55\)
\(11+12+13+14+15+16+17+18+19+20=155\)
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20+21+22+23+24+25+26+27+28+29+30+31+32+33+34+35+36+37+38+39+40+41+42+43+44+45+46+47+48+49+50=1275
10(81+19)+100+50(91+9)
=10.100+100+50.100
=1000+100+5000
=6100
=14.5.35+10.5.5.7+4.5.7
=70.35+50.35+4.35
=35.(70+50+4)
=35.124
=4340
Câu 4:
15.(27 + 18 + 6) + 15.(23.12)
= 15.(27 + 18 + 6 + 23.12)
= 15.(27+ 18+ 6 + 276)
= 15.(45 + 6 + 276)
= 15.(51 + 276)
= 15.327
= 4905
Câu 5:
24 x (15 + 49) + 12 x (50 + 42)
= 12 x (30 + 98)+ 12 x (50 + 42)
= 12 x 128 + 12 x 92
= 12 x (128 + 92)
= 12 x 220
= 2640
14.35.5 + 10.25.7 + 20.7
= (14.5).35 + (10.7).25 + 2.(10.7)
= 70.35 + 70.25 + 2.70
= 70.(35+ 25 + 2)
= 70.62
= 4340
Câu 4:
15.(27 + 18 + 6) + 15.(23.12)
= 15.(27 + 18 + 6 + 23.12)
= 15.(27+ 18+ 6 + 276)
= 15.(45 + 6 + 276)
= 15.(51 + 276)
= 15.327
= 4905