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=10×(
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=10×1
=10
②4.86×[1÷(2.1-2.09)]
=4.86×(1÷0.01)
=4.86×100
=486
③8.8-6.75+9.2-0.25
=(8.8+9.2)-(6.75+0.25)
=18-7
=11
④99999+9999+999+99+9+6
=(99999+1)+(9999+1)+(999+1)+(99+1)+(9+1)+1
=100000+10000+1000+100+10+1
=111111
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