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79✘16+78✘78+79✘6的...

4x-4x+1=x+6x+93x-10x-8=0(3x+2)(x-4)=x=4或x=-3分之2

7x-√6x-5=0用公式x=[-b±√(b-4ac)]/2ax=(√6±√146)/14

7.8X5.6+2.3X4.4=(8-0.2)X(6-0.4)+(3-0.7)X(5-0.6)=48-3.2-1.2+0.08+15-1.8-3.5+4.2=57.58百度专家组

一:a=7 b=-√6 c=-5△=b^2-4ac=6-4*7*(-5)=6+140=146x=(-b土√146)/2a=(√6土√146)/14x1=(√6+√146)/14x2=(√6-√146)/14二:x-√6x/7=5/7x-√6x/7+6/196=5/7+6/196(x-√6/14)=146/19

6.28-1.28-1.18=5-1.18=3.82

原式化简后得30/x-45/2x=3通分后去分母得60-45=6x6x=15x=15/6=5/2=2.5

=2.87*10*6=28.7*6=172.2

26X24一24X6的简便计算?26X24一24X6=24*(26-6)=24*20=480

4.9*99+99=(4.9+1)*99=5.9*(100-1)=5.9*100-5.9*1=590-5.9=590-(6-0.1)=590-6+0.1=584.1

= -(1+2) - (3+4) - - (9+10) = - ( 1+ 2+3+ + 10) = - 55

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