题目

解方程：3x2﹣4x+1=0． 答案：3x2﹣4x+1=0， （3x﹣1）（x﹣1）=0， 3x﹣1=0，x﹣1=0， x1=，x2=1． 【点评】本题考查了解一元二次方程的应用，能选择适当的方法解一元二次方程是解此题的关键，注意：解一元二次方程的方法有：直接开平方法，公式法，配方法，因式分解法．阅读理解阅读下列短文，从每题所给的四个选项（A、B、C和D）中，选出最佳选项。APaper is a cheap and accessible medium that can produce beautiful results. To most people, making a paper plane could be one of the simplest things to do. It’s the simplest and easiest form of paper art. And paper art can be dated back to Japan, where it originated (起源于) over a thousand years ago. However, there’s a special minority who takes paper art to the next level, magically turning the plain white or colored paper into some of the most amazing artworks. Check out the following artists and their works!The Danish artist Peter Callesen is famous for his talent in combining the minimalism (极简单) of a white sheet of paper with the complexity of carefully cut and folded paper and uses the two to build out some pleasing works.The British artist Su Blackwell often goes to secondhand bookstores — to look for materials with which she can carve out delicate sculptures. The models look as if they “grow” naturally from the pages of the books. The artist finds inspiration from the book title or a paragraph or picture inside and then spends months carefully making each one into an eye-catching paper model. Her old book sculptures sell for up to￡5,000 each.By carefully folding simple pieces of paper, German artist Simon Schubert creates amazing masterpieces. He turns paper into architectural masterpieces by folding a simple piece of paper to shape the creases (摺缝), then unfolding it to show the fascinating artwork.Another master of paper-folding is Jen Stark. Her artwork is often in the form of colorful caves and land maps. Using her imagination and a special knife, she is a modern day magician who turns humble materials like construction paper and glue into fantastic, complicated sculptures that puzzle the eyes. Her work draws inspiration from nature.【1】According to the passage, paper art ________.A. is about plane-folding B. is richest in JapanC. dates back to 1000 B.C. D. is now on a new level【2】The British artist mentioned in the passage ________.A. combines the minimalism and complexity of paperB. often gets inspired by secondhand booksC. makes architectural masterpieces with Simon SchubertD. is a magician who uses simple paper materials【3】According to the passage, Jen Stark ________.A. is from GermanyB. uses paper to build complicated shapesC. creates things too puzzling to understandD. works also as a magician【4】What does the underlined word “humble” in the last paragraph probably mean?A. Common and popular. B. Simple and cheap.C. Useless and priceless. D. Rough and meaningless.