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Các câu hỏi tương tự
97/20 x ( 25/8 - 221/200 )< x < 91/10 x (137/20 + 11/4)
1) 15 - 98 + 91 - 75 + 98 - 91 - 13
2) 5 - ( 4 - 7 + 12 ) + ( 4 - 7 + 12 ) - 10
3) 20 - ( 25 - 98 + 12 ) + ( 25 - 98 - 72 )
4) - ( 17 - 4 + 13 + | -17 | + 13 )
5) | -16 | - ( 5 - 8 + 7) - ( - 5 ) - 8
6) -20 + ( 3 - 16 + 7 ) - ( 3 - 16 + 7 )
7) 32 - ( 5 - 8 + 32 ) + ( 5 - 8 + 6 )
8) -20 - ( 25 - 11 + 8 ) + ( 25 - 8 + 20 )
tinh nhanh
a,A=100+98+96+...+2-97-95-...-1
b,B=1+2-3-4+5+6-7-8+9+10-11-12+...-229-330+301+302
c,C=41*66+34*41/3+7+11+...+79
d,D=1+2+3+...+200/6+8+10+...+34
e,E=1*5*6+2*10*12+20*24*4+9*45*54/1*3*5+2*6*10+4*12*20+9*27*45
(a) S = −11 − 12 − 13 + 91 + 92 + 93
(b) S = −111 + 223 − (123 − 111)
(c) S = (127 − 263) − (27 − 153)
(d) S = (−2)4.289 − 16.189
(e) S = −56.43 + (−56).25 − 56.32
(f) S = −2.(77 − 20) + 77(2 − 20)
(g) S = −11(200 + 31) − 31(−11 − 100)
Bài 8: tìm x
a) x + 10 = 20
b) 2 . x + 15 = 35
c) 3 ⋅ ( x + 2 ) = 15
d) 10 . x + 15 . 11 = 20 . 10
e) 4 . ( x + 2 ) = 3 . 4
f) 33 x + 135 = 26 . 9
g) 2 . x + 15 + 16 + 17 = 100
h) 2 . (x + 9 + 10 + 11) = 4 . 12 . 25
a,-5+(-10)+(-15)+(-20)+.......+(-100)
b,-4+(-8)+(-12)+(-16)+.........+(-100)
c,1+(-3)5+(-7)+9+(-11)+.......+97+(-99)
Bài 8: tìm x
a) x + 10 = 20
b) 2 . x + 15 = 35
c) 3 ⋅ ( x + 2 ) = 15
d) 10 . x + 15 . 11 = 20 . 10
e) 4 . ( x + 2 ) = 3 . 4
f) 33 x + 135 = 26 . 9
g) 2 . x + 15 + 16 + 17 = 100
h) 2 . (x + 9 + 10 + 11) = 4 . 12 . 25
a.(7/8-3/4).1/3-2/7.(3,5)
b.(3/5+0,415-3/200).2 2/3.0,25
c.5/16:0,125-(2 1/4-0,6).10/11
d.0,25:(10,3-9,8)-3/4
e.1 13/15.0,75-(11/20+25%):7/3
7^91:7^89+5.5^2-124
4.15+28:7-6^20:6^18
(3^2+2^3):7
11^25:11^23-3^5:(1^10+2^3)-60
5^20:(5^5.6+5^15.19)