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27 0.2 5用简便计算

等于0.2*0.27+0.27*1.8 等于2*0.27 等于0.54

2 7 -(-0.2),=2 7 +1 5 ,=17 35 .故答案为:17 35 .

5/0.2-0.2/5 (通分最简)=(5*5 -0.2*0.2)/(0.2*5)=25-0.04=24.96

先把括号打开 先算5*4=20 在用20*27=540就很简便啦~~ 呵呵 希望能帮到你哦

202x27-5=200*27+2*27-5=540+54-5=540+55-5-1=540+50-1=590-1=589

1.68/0.2/5=42/25*5/1*5/25=42

解 3.2÷5÷0.2=3.2÷(5*0.2)=3.2÷1=3.2.

=6*5*27=30*27=810

2.7x10.2用简便计算=2.7x(10+0.2)=2.7x10+2.7x0.2=27+0.54=27.54

=2.7*98+2.7*2 (这里,把0.2的小数点“借”给了27)=2.7*(98+2) (这里,乘法分配律)=2.7*100=270

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