Question

Efectueaza:
[(7:7+4) : 5+9] ×78=

[(60:6+20) +25] : 5=

900+300 : 10 -[76+(290-206)]=

[( 10:10+4):5+9] × 1000+700:100+11×18=

[420:(160-500:4)+25×4] × 100=

[20×(8-100:25) + 2×10] :10+17×100=

Answer 1

[(7:7+4):5+9]×78=[(1+4):5+9]×78=(5:5+9)×78=(1+9)×78=10×78=780

[(60:6+20)+25]:5=[(10+20)+25]:5=(30+25):5=55:5=11

900+300:10-[76+(290-206)]=900+30-(76+84)=900+30-160=930-160=770

[(10:10+4):5+9]×1000+700:100+11×18=[(1+4):5+9]×1000+7+198=(5:5+9)×1000+7+198=(1+9)×1000+7+198=10×1000+
+7+198=10000+7+198=10007+198=10205

[420:(160-500:4)+25×4]×100=[420:(160-125)+100]×100=(420:35+100)×100=(12+100)×100=112×100=11200

[20×(8-100:25)+2×10]:10+17×100=[20×(8-4)+20]:10+1700=(20×4+20):10+1700=(80+20):10+1700=100:10+1700=10
+1700=1710

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