2.7÷(1-20%-18%)要过程

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2.7÷(1-20%-18%)要过程
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2.7÷(1-20%-18%)要过程
2.7÷(1-20%-18%)要过程

2.7÷(1-20%-18%)要过程
=2.7/(80%-18%)
=2.7/0.62
=4.35

1/3×5 +1/5×7 + 1/7×9 + …+ 1/99×101 =1/2×(1/3-1/5)+1/2×(1/5-1/7)+……+1/2×(1/99-1/101) =1/2×(1/3-1

2.7÷(1-20%-18%)
=2.7÷(1-38%)
=2.7÷62%
=2.7÷0.62
=135/31
(除不尽的。)

2.7÷(1-20%-18%)
=2.7÷(1-38%)
=2.7÷62%
=2.7÷0.62
=135/31
我这周刚刚考试考过。