\(35^2-25^2=\left(35-25\right)\left(35+25\right)=10.60=600\)
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1/2×(2×x-3)+105/2=-137/2 A,-12×25-25×75-25×13 B,-50/7×49/10-35/2×-10/7+ -25/3× -9/5 C,-354+265-156+125 D,-74+40-50+16-35 E,-2/3×4/5+-4/5×4/3-0,125
Tính hợp lí nhất
1, 2155– (174 + 2155) + (-68 + 174)
2, -25 . 72 + 25 . 21 – 49 . 25
3, 35(14 –23) – 23(14–35)
4, 8154– (674 + 8154) + (–98 + 674) 5, – 25 . 21 + 25 . 72 + 49 . 25
6, 27(13 – 16) – 16(13 – 27)
7, –1911 – (1234 – 1911)
8, 156.72 + 28.156
9, 32.( -39) + 16.( –22)
10, –1945 – ( 567– 1945) ...
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Tính hợp lí nhất
|
1, 2155– (174 + 2155) + (-68 + 174) 2, -25 . 72 + 25 . 21 – 49 . 25 3, 35(14 –23) – 23(14–35) 4, 8154– (674 + 8154) + (–98 + 674) 5, – 25 . 21 + 25 . 72 + 49 . 25 6, 27(13 – 16) – 16(13 – 27)
|
7, –1911 – (1234 – 1911) 8, 156.72 + 28.156 9, 32.( -39) + 16.( –22) 10, –1945 – ( 567– 1945) 11, 184.33 + 67.184 12, 44.( –36) + 22.( –28)
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13/25+6/41−38/25+35/41−1/2
B= 1037 + { 743 - [ 1031 - (+57) ] }
C= ( 125x 73 - 125 x 75): ( -25 x 2)
D= - 25 x ( 35 + 147)+ 35 x ( 25 + 147)
E= 125 x 9x (-4)x (-8) x 25 x 7
G= ( -3)2 + ( - 5)3 : /-5/
tính hợp lý nếu có thể
a, {-5}^3 +2012 + |-3|+2.{-3}
b, {-25}.{35+147}+ 35 .{25+147}
Tính hợp lí nhất:
1) 2155 - (174 + 2155) + (-68 + 174)
2) -25 . 72 + 25 . 21 - 49 . 25
3) 35(14 - 23) - 23(14 - 35)
4) 8154 - (674 + 8154) + (-98 + 674)
bài 1:
a. S2 = 21+23+25+...+1001
b. S4 = 15+25+35+..+115
bài 2:
a. 2x-138= 23 .32
b. 5.(x+35) = 515
c. 814- ( x-305)=712
d. 20 - [ 7(x-3) +4] =2
e. 9x-1 =9
e. 5x-2 -32 = 24 - (28. 22 - 210 . 22)
2 . 53 . 27 + 6 . 9 . 87 - 3 . 18 . 40 = ???
12 . 25 + 29 . 25 + 59 . 25 = ???
43 . 37 + 93 . 43 + 57 . 61 + 69 . 57 = ???
12 . 53 + 53 . 172 - 53 = ???
35 . 54 + 35 . 58 + 65 . 75 + 65 . 45 = ???
39 . 8 + 70 . 3 + 31 . 8 = ???
tính hợp lí nếu có thể :
A = [-506 + 732 - (-2000) - (506 - 1732)
C = (125 . 73 - 125 . 75) : (-25 . 2)
E = 125 . 9 . (-4) . (-8) . 25 . 7
B = 1037 + {743 - [1031 - (+57)]}
D = -25 . (35 + 147) + 35 . (25 + 147)
G = (-3)2 + (-5)3 : |-5|
9-25=(7-x)-(25+7)
-6x=18
35-3.IxI =5.(2 mũ 3-4)
10+2.IxI=2.(3 mũ 2-1)