(1)23-17-(-7)+(-16) (2)123×80%=x×(1+10%)
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(1)23-17-(-7)+(-16) (2)123×80%=x×(1+10%)
(1)23-17-(-7)+(-16)
(2)123×80%=x×(1+10%)
(3)1-(1-0.5)÷3×[2-(-3)的2次方]
(1)23-17-(-7)+(-16)
(2)123×80%=x×(1+10%)
(3)1-(1-0.5)÷3×[2-(-3)的2次方]
(1)23-17-(-7)+(-16)
=23-17+7-16
=23-10-16
=13-16
=-3
(2)123×80%=x×(1+10%)
123×0.8=1.1x
123×8=11x
11x=984
x=984/11
(3)1-(1-0.5)÷3×[2-(-3)的2次方]
=1-0.5÷3×[2-9]
=1-1/2÷3×(-7)
=1+1/2÷3×7
=1+1/2×1/3×7
=1+7/6
=13/6
=23-17+7-16
=23-10-16
=13-16
=-3
(2)123×80%=x×(1+10%)
123×0.8=1.1x
123×8=11x
11x=984
x=984/11
(3)1-(1-0.5)÷3×[2-(-3)的2次方]
=1-0.5÷3×[2-9]
=1-1/2÷3×(-7)
=1+1/2÷3×7
=1+1/2×1/3×7
=1+7/6
=13/6
y=(x-1)(x-2)(x-3)(x-4)(x-5)(x-6)(x-7)(x-8)(x-9)(x-10)的导数在x=1
设函数f(x)=(x-1)(x-2)(x-3)(x-4)(x-5)(x-6)(x-7)(x-8)(x-9)(x-10),
1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550
2x平方+3x=3 (用配方) x(2x-5)=4x-10 x平方+5x+7=3x+11 1-8x+16x平方=2-8x
1x()+2x()+3x()+4x()+5x()+6x()+7x()+8x()加9x()+10x()=1980
1X?+2X?+3X?+4X?+5X?+6X?+7X?+8X?+9X?+10X?=1980求?是多少
|X-1|+|X-2|+|X-3|+|X-4|+|X-5|+|X-6|+|X-7|+|X-8|+|X-9|+|X-10|
已知x=9/2 求:[(x^+7x+10)/(x^2+6x+5)]×[(x^3+1)/(x^2
解方程(4x^3+10x^2+16x+1)/(2x^2+5x+7)=(6x^3+10x^2+5x-1)/(3x^2+5x
x*x+2x+x*x+10x+x*x+25+2x+x*x+1+1+16+x*x+4x*x+9-12x+16x*x+4-1
解方程(x/x(x+2))+(x/(x+2)(x+4))+.+x/(x+8)(x+10)=1
5x-2=8 1/4x=-1/2x+3 10x-3=9 5x-2=7x+8 x=3/2x+16 1-3/2=3x=5/2