Matematică
SmileyFace
2015-11-18 10:57:45
afla numarul necunoscut din:1730÷[(21×b-33)-4]×20-16=184;[10+10×(a-10)]÷10-10=10;1200-(2x+100):19+2500=3500
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cirlig
2015-11-18 14:48:41

1730÷[(21×b-33)-4]×20-16=184 1730÷[(21×b-33)-4]×20=184+16 1730÷[(21×b-33)-4]×20=200 1730÷[(21×b-33)-4]=200:20 1730÷[(21×b-33)-4]=10 (21×b-33)-4=1730÷10 (21×b-33)-4=173 21×b-33=173+4 21×b-33=177 21×b=177+33 21×b=210 b=210÷21 b=10 [10+10×(a-10)]÷10-10=10 [10+10×(a-10)]÷10=10+10 [10+10×(a-10)]÷10=20 10+10×(a-10)=20×10 10+10×(a-10)=200 10×(a-10)=200-10 10×(a-10)=190 a-10=190÷10 a-10=19 a=19+10 a=29 1200-(2x+100):19+2500=3500 1200-(2x+100):19=3500-2500 1200-(2x+100):19=1000 (2x+100):19=1200-1000 (2x+100):19=200 2x+100=200×19 2x+100=3800 2x=3800-100 2x=3700 x=3700÷2 x=1850

Gify2015
2015-11-18 14:49:56

1730÷[(21×b-33)-4]×20-16=184 1730÷(21×b-37)×20=184+16 1730÷(21×b-37)×20=200 1730÷(21×b-37)=10 21×b-37=173 21×b=173+37 21×b=210 b=10 [10+10×(a-10)]÷10-10=10 (10+10×a-100)÷10=20 10×a-90=200 10×a=290 a=29 1200-(2x+100):19+2500=3500 -(2x+100):19=3500-2500-1200 (2x+100):19=200 2x=3800-100 2x=3700 x=1850

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