数字运算（Digital operation）.doc

数字运算（Digital operation） Digital operation You can run it on scratch paper, and when you have a problem, you can skip it and do it again when you have time. Example: The sum of 84.78, 59.50, 121.61, 12.43, and 66.50 is..: A, 343.73 B, 343.83 C, 344.73 D, 344.82 The correct answer is D. In fact, as long as you add the last decimal, you will find that the number of bits is 2, only D meets the requirements. Please begin the examination: The value of 1. 32.8+76.4+67.2+23.6-17 is L A, 176 B, 182.4 C, 183 D, 173 2. known positive numbers a and B satisfy a+b=1, then + values. A, B 2, more than 3 C and less than or equal to D and less than or equal to 2 The value of 3.478 * 365-1 is: A, 174473 B, 174469 C, 16729 D, 16723 4. young pioneers, fourth squadrons of castor beans, the first day planted 180, second days planted 166, third days planted 149. How many trees are planted on an average day?: A, 166 B, 167 C, 164 D, 165 5. as shown in Figure 1, the girth of the parallelogram ABCD is 28cm, CA-AD=2cm, and the length of AB is..: A, 8cm, B, 6cm C, 7cm, D, 9cm (Figure 1) 6. known X=-2, Y=, then the value of X-2 (X-Y2) - (X-Y2) is: A, B, - C, D, - 7., a bottle containing alcohol, poured into 500 grams, later poured out half, and then poured into 500 grams, then there are 1200 grams of alcohol in the bottle, ask how much alcohol in the bottle: A, 750 grams of B, 800 grams of C, 850 grams of D, 900 grams 8., the total grain output of our country was 84 million 880 thousand tons in 1936 before the founding of new China. In 1949, it was 28 million 300 thousand tons more than in 1936. In 1989, it was 68 million 10 thousand tons more than that in 1949 by 3 tons. How many tons of grain output in China in 1989?: A, 428 million 750 thousand tons, B, 407 million 550 thousand tons, C, 376 million 250 thousand tons, D, 398 million 750 thousand tons 9. the smallest of the following options is: A, B, C, - 1, D, 10. as shown in Figure two, the line SA is perpendicular to the square ABCD, and A