How to do the third question on page 75 of the fifth grade math book: jump x times per minute before exercise
X+55= 130
X=75
A: Jump 75 times per minute before exercise.
How to do the second question on page 94 of the fifth grade math book? Can be divided into three kinds of graphics:
1. Two right-angled trapeziums
2. By adding and supplementing, it can be divided into rectangle and triangle (subtraction).
3. Divide into 1 square and 2 triangles.
1 solution: (80-20+80) × 30 ÷ 2× 2 = (60+80) × 30 ÷ 2× 2.
= 140×30÷2×2
=4200÷2×2
=4200(cm? )
2 solution:
80×(30+30)-(30+30)×20÷2
=80×60-60×20 ÷2
=4800- 1200÷2
=4800-600
=4200(cm? )
3 solution:
(80-20)×(30+30)+30×20÷2×2
=60×60+30×20÷2×2
=3600+600÷2×2
=3600+600
=4200(cm? )
A: Does it take 4200cm to make a team flag? Cloth.
How to do the 8* problem on page 87 of the first volume of fifth grade mathematics is PEP, right?
540×2÷ 18=60 (m)
540× 2 ÷ 22.5 = 48m
Circumference: (60+48)×2=2 16 (m)
540*2/22.5 equals 48.
540*2/ 18 equals 60.
(48+60)*2 equals 2 16.
How to do the problem of page 73 10 in the fifth grade math book? 35÷5-3=x
7-3 =x
X =4 (times)
How to do six questions on page 37 of the first volume of the fifth grade math book? Because the decimal point is a little to the right, the result is 24.6, so the correct quotient should be 24.6, and then calculate the divisor according to "divisor = dividend quotient"
3.69÷2.46= 1.5
How to divide 48 by 2 and divide it by 2= 12 (square meter) on page 87 of the fifth grade math book?
How to do the question 1 1 on page 64 of the first volume of the fifth grade math book? 1. Solution: Suppose a * * is equipped with an X tube.
5x+3= 1428
5x+3-3= 1428-3
5x= 1425
5x \5 = 1425 \5
x=285
A: One * * * has 285 tubes.
2. Solution: Let Tiananmen Square cover an area of X million square kilometers.
2x- 16=72
2x- 16+ 16 = 72- 16
2x=56
2x \2 = 56 \2
x=28
Tiananmen Square covers an area of 280,000 square kilometers.
3. Solution: Assume that the average annual precipitation in Tongxin County is x mm.
8x+ 109=2325
8x+ 109- 109 = 2325- 109
8x=22 16
8x \8 = 22 16 \8
x=277
A: The average annual precipitation in Tongxin County is 277mm.
The ninth problem on page 67 of the fifth grade math book, 4x plus 13=365 solution; X=365- 13 4x=352 x=352 divided by 4 x=88.