Three. 18× 12 ÷ 30× 15 ÷ 2
=2 16÷2 =450÷2
= 108(cm？ )=225(dm？ )
The fifth grade mathematics evaluation manual, volume 1, page 5, question 6 120 cm2.
What's the answer to 3.4.5 on pages 3, 4 and 5 of 10, the first volume of primary school mathematics evaluation manual, and what are you doing? 0.8*0.9 Keep one bit ≈0.7 1.7*0.45 Keep two bits ≈ 0.77 72 * 0.81+10.4.
=58.32+ 10.4
=68.72
7.06*2.4-5.7
= 16.944-5.7
= 1 1.244
The fifth question on page 79 of the fifth grade mathematics evaluation manual is how to write a nickname and Xiao Qiang to buy a table tennis bat. If you buy one separately, Xiaoming is short of 3.5 yuan and Xiao Qiang is short of 4.7 yuan. If they buy together, there will be more 7.8 yuan. How much is a table tennis bat?
The fifth grade evaluation manual has 2627 pages of mathematical answers. Are there 2627 pages?
The answer to the second volume of the fifth grade mathematics evaluation manual P25 1, (1) 7/4 = 1 3/6 right 17=2 5/6 right.
(2) numerator, denominator, fractional integer part and fractional numerator remain unchanged.
(3) two-sevenths of five rights, two-sevenths of five rights.
(4) 2,3,5,6. 1,4。
(5) 1, 2 of 7.
(6) 3/2, 5/3 and 5/2. Three fifths, two fifths, two thirds.
(7) Less than 5, greater than or equal to 5, and multiples of 5 are equal to 6.
Two, three right one five, three, ten right one eight, three right seven thirty.
Three. 1= 7/7，= 43/5，6= 24/4。
Four, (13- 1)/3=4 three right quarters.
(I have all the answers in the evaluation manual, standard)
How to write the sixth question on the fifth page of the fifth grade mathematics evaluation manual? Teacher Wang bought five footballs and 1 basketball with 420 yuan. One basketball is more expensive than the other, 60 yuan. How much is basketball and football each? Solve by equation
Solution: Let football be X yuan, then basketball is (X+60) yuan.
5*X+(X+60)=420
5X+X+60=420
6X=360
X=60
X+60=60+60= 120
A: Every football 60 yuan, every basketball 120 yuan.
The seventh page of the evaluation manual of the first volume of fifth-grade mathematics answers the first page of fifth-grade mathematics learning and evaluation, and the answer on page 42 is set to mercury x days and a week.
Equation: 4x 13=365.
4x=352
X=88 A: So Mercury goes around the sun for 88 days.
The answer to the fourth question on page 40 of the first volume of the fifth grade mathematics evaluation manual. Do something! ... I didn't do the assessment in elementary school, but I did it in junior high school. . . Sorry, I can't help you.