1.5×2/5=
5/9× 1.8=
2.5×0.4=
24×3/8=
2.4+ 1.6=
5/ 12÷5/6=
5/7×2 1/25=
1/4÷25%=
32× 2.5 = 2. Calculation (if it can be simplified) 4.67-(2.98+0.67)
73.8× 16-73.8×6
(4/5+1/4) ÷ 7/3+7/10 three. Column synthesis formula or equation calculation. 1, a number is 1.2, which is more than 30% of 40. Find this number. 2, 10. Fill in the blanks. 1, the number a is 2 1, the number b is 30, and the number a is less than the number b (
)% .2 There are 29 students in grade five, more than girls 16%, and girls have (
) people. 3,365.5505 Writing (
) .4. The side length ratio of triangular vegetable field is 3: 4: 5, and the circumference is 84m, of which the shortest side length (
The ratio of the circumference to the diameter of a circle is (
) 6, 3.6 = (
) (
) 7. It takes 4 days for Party A to complete the same work alone, and 5 days for Party B. The work efficiency of Party A is Party B's (
)% 8, sampling inspection of a commodity, 38 qualified, 2 unqualified, the qualification rate of the commodity is (
9. Turning 7/8: 1.75 into the simplest integer ratio is (
), the ratio is (
). 10, the hour hand of a wall clock is 5 cm long, and its tip has been walking for a day and a night (
) cm. 1 1, the base of a triangle is 4 cm long and the height is 2 cm, and the ratio of the area of this triangle to the area of a parallelogram with the same base height (
). 12, 2/3 of A is equal to 3/4 of B, and the simplest integer ratio of A and B is (
) .5. Judges. 1. Because 3 ÷ 1.5 = 2, 3 can be divisible by 1.5. (
) 2. Bar charts can not only represent quantity, but also represent the change of quantity. (
) 3. The number of copies of China Youth Daily is in direct proportion to the money spent.
4. The sum of subtraction and difference is equal to 1/2 of the sum of minuend, subtraction and difference. (
If a divided by b equals 5 divided by 3, then a is 3/5 of b.
The product of a number multiplied by a fraction is less than the multiplicand.
) 7. The diameter is the longest line segment in a circle.
) 8, 4 and 0.25 are reciprocal.
9, A and B are natural numbers, because A ÷ 3/4 = B × 4/5, so A >；; b .(
) 10, the circumference of any circle is always π times its diameter. (
) 1 1. Remove the zero after the decimal point, and the size of the decimal point remains the same. (
) 12. Two numbers are prime numbers, and the least common multiple of these two numbers is their product. (
) Application question 1. A typist typed a manuscript. On the first day, he typed 25% of the total. On the second day, he typed 40% of the total. On the second day, he typed six more pages than on the first day. How many pages are there in this manuscript? There are 540 boys in the school, 60 fewer than girls, 5 less than 6. How many girls are there in the school? 3. For a pile of coal, the ratio of tonnage transported on the first day to total tonnage is 1: 3. 4.5 tons were shipped the next day, and just half of the total tonnage was shipped in two days. How many tons is this pile of coal? 4. Make a rectangular water tank (without cover) with iron sheet, 3 meters long, 0.8 meters wide and 0.5 meters high. How many square meters of iron will be used? (Keep the whole square meter and get an approximate value in one way. ) 5. If the park tickets are for every 8 yuan, is it enough for a school to organize 97 students to go to the park? 6. It takes 20 hours to produce a batch of parts, and the working efficiency of B is 80% of that of A. If two people work together, how many hours will it take to produce this batch of parts? 7. There are 150 books in kindergartens in Le Tong, 40% of which are allocated to large classes, and the rest are allocated to small classes and middle classes according to the ratio of 4: 5. How many books are there in the small class and the middle class?