thuc hien phep tinh
a)43.37+93.43+57.61+69.57
b)39.8+60.2+21.8
thuc hien phep tinh
a)28.64+14.72
b)3.25.8+4.37.6+2.32.12
c)19.126+37.38
d)35.34+35.38 +65.75+65.45
e)39.8+60.2+21.8
f)36.38+36.82+64.69+64.41
m)37.7+80.3 +43.7
n)43.37+93.43+57.61+69.57
a 2008
b 2256
c 3800
d 10320
e 600
f 11360
m 800
n 13000
a)2800
b)2256
c)3800
d)10320
e)600
f)11360
m)800
n)13000
39.8+60.2+21.8=...
\(39.8+60.2+21.8=100+21.8=121.8\)
39.8+60.2+21.8
39.8+60.2+21.8
Tính nhanh
2.7.4+2.23.50
43.37+93.43+57.61+69.57
43.37 + 93.43 + 57.61 + 69.57
= 43.(37+93) + 57.(61+69)
= 43.130 + 57.130
= 130.(43+57)
= 130.100
= 13000
43 x 37 + 93 x 43 + 57 x 61 + 69 x 57
= 43 x ( 37 + 93 ) + 57 x ( 61 + 69 )
= 43 x 130 + 57 x 130
= ( 43 + 57 ) x 130
= 100 x 130
= 13000
A,= 2.( 4.50)+ ( 7.4.23)
=2.200 + 644
=400+ 644
=1044
B, = 43.( 37 + 93)+ 57.(61+69)
=43.130 + 57.130
=130.( 43 + 57)
=130 + 100
=13000
tính bằng cách hợp lí nhất
a) 37.7+80.3+43.7
b) 43.37+ 93.43+ 57.61+ 69.57
c) 123.456+ 456.321- 254.444
1 thuc hien phep tinh
a, 3x2y (3x – 4y); b, ; c, (3x + 5)( 3xy - 5x)
a: 3x^2y(3x-4y)
=3x^2y*3x-3x^2y*4y
=9x^3y-12x^2y^2
c: (3x+5)(3xy-5x)
=9x^2y-15x^2+15xy-25x
* 39.8+60.2+21.8
* 37.7+80.3+43.7
* 123.456+456.321-256.444
Nhờ mn giải giùm e nha!
\(39.8+60.2+21.8=39.8+15.8+21.8=8\left(39+15+21\right)=8.75=600\)
* 39,8 + 60,2 + 21,8
= 100 + 21,8
= 121,8
* 37,7 + 80,3 + 43,7
= 118 + 43,7
= 161,7
* 123,456 +456,321 - 256,444
= 579,777 - 256,444
= 323,333
~ Học tốt ~
* 39.8+60.2+21.8 * 37.7+80.3+43.7 *123.456+456.321-256.444
=8(39+21)+120 =7(37+43)+240 =456(123+321)-256.444
=8.60+120 =7.80+240 =456.444-256.444
=480+120 =560+240 =444(456-256)
=600 =800 =444.200
=88800
Hok tốt
thuc hien phep tinh
a.27.332+93.43+57.61+69.57
b.34.75+75.66-65.100
c.62:4.3+2.52
d,5.42-18:32
e,20-[30-(5-1)2)
g,3.52-16:23+34:33