The area of the shaded part is the area of the trapezoidal EFCO.
(10-4+10) × 2 ÷ 2 =16 (square centimeter)
P 14- 15
1, oral calculation 92.40.21.167 0.50.99 4.60.902 2
Step 2 fill in the blanks
( 1)2/7 7/ 12
(2)5 times
(3)4a a2
(4)3x+2 3x+2=4 1
(5) 1. 1 1.08
3. Vertical calculation
287. 1 8.9
Step 4 solve the problem
(1)40(50×2)= 0.4 (minutes)
(2)495( 100- 1)= 5 (kg)
(3) red 1/4 yellow 1/4 blue 1/2
(4) 160 ÷ 8 × 4 = 80 (times)
5. Use your head 3/ 16
P 16- 17
1, oral calculation13.27 0.18 0.72 0.56 0.75 50 3/47/127/10
Step 2 fill in the blanks
(1) 52cm 92m2
(2)7/8 8/8
(3)76 96
(4) 1/7 2m
Step 3 choose
( 1)B
(2) Answer
(3)C
4. Solve the equation
X=0.49 x=7. 15 x = 4.2
5. Vertical calculation 8.579 5.5438+0475
Step 6 solve the problem
(1) Solution: Let the fruit market put x tons of plows 3x-0.3=5.4 X = 1.9.
(2) Solution: Let rice be15 (x+3.7) =102.6x = 3.14.
(3) Solution: If there are X pear trees, there are 3x peach trees. 3x-x = 80x = 403x = 40x3 = 120。
7. Think about10+10 ÷ 2× 2+/0 ÷ 2× 2+10 ÷ 2× 2 = 27.5 meters.
P 18- 19
1, 7.2184.20.019.422/31801.71015.
2. Fill in the blank (1)0.85 7 liter 50 ml (2) 2 1 (3)4.95 5.0 (4)3.7.
3. Observe that AB is 3 cm long and CD is half that of AB.
4. Solve the equation X= 18 x=3.7 x=7 x=62.
Step 5 draw a picture
6. Accounting invoice 50× 4.58 = 229.00 23× 7.60 =174.80 2× 20 = 40.00, total: 229+174.8+40 = 4.438 million four hundred and forty-three yuan and eight cents.
Use your head: shadow area = trapezoidal ABGD area 170×2÷ 10-25=9 cm.
P20-2 1
1, oral calculation
Fill in the blank (1)145 (2) 433242 (3)1/443/10001/32/5.
3. Outpatient service ××××××
4. Close-packed rectangles, regular hexagons, parallelograms, triangles and trapeziums.
Step 5 solve the problem
(1)12.8÷ (6.4×1.6) =1.25 (m)
(2)3×2×0.5 = 3 cubic meters 750× 3 = 2,250 kg.
(3) (20.5-10) ÷1.5+4 =11(km)
6. Use your head, add Class A and Class B to Class C and Class D, and subtract Class B and Class C from the number of four classes, that is, Class A and Class D ... 83+88-86=85 (person)
Page 22-23
1, oral calculation
2. Fill in the blanks (1) 248 (2) 8 (3) 6315800 (new qi)
3. Calculate 1 and1/9 2.
4. Check Beijing 0 10 Tianjin 022 Shanghai 02 1 Guangzhou 020 Hangzhou 057 1 Wenzhou 0577 Xiamen 0592 Chongqing 023 Urumqi 099 1.
Step 5 solve the problem
( 1) 1-5/8=3/8
(2) How many parts of the total length have been repaired? 1/3+ 1/4=7/ 12 ……
(3) 2.5 × 2 ÷ 2 = 2.5m.
(4) Yes, this student ID card represents the number 12 of Class 3 that bright primary school entered in 2006.
Boys can also use 1, and girls use 2 at the bottom.
6. Use your head 95 ÷ (2+3) =192×19 = 383×19 = 5738/57.
P24-25
2. Fill in the blank (1) m3 ml1800 (2)1/417/21/251/5.
3. Judge ××××××
Page 26-27
2. Fill in the blank: (1) 496 (2) 83/1000 25/366 (3) a-10b.
3. Fill in (1) green, blue and black (2) 3
4、 14.54 7.245
5. C is chosen because the length and width of the wall can be divided by the length and width of the tile respectively.
Step 6 solve the problem
( 1)= 12, 12 ×4=48
(2) 8.5× 6+(8.5× 3+6× 3 )× 2-12.5 =125.5 (square meters) 125.5×6=753 (yuan)
(3)( 10+ 1)×8=88 yuan.
Exercise the brain.
Decimal part: (5.8-3.4)÷(8-4)=0.6
Integer part: 3.4-0.6×4= 1
Original decimal: 1+0.6= 1.6.
Pages 28 and 29
Step 2 choose bb bb
4 、( 1)24 30 (2) 2 1 (3) Y = 6X
Step 5 solve the problem
(1) (6+12) × (12-6+1) ÷ 2 = 63 (root)
(2) 3 decimeter =30 cm 50×40×(30-25)= 1000 cubic centimeter = 1 cubic decimeter.
P30\3 1 2, fill in the blanks (1)14/27 21/43 (2) 0.40.29 (5)16.