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(x+8)÷7=5等于多少

(x+8)÷7=5 x+8=5x7 x+8=35 x=35-8 x=27

5(x+8)=6(2x-7)+5 解:5(x+8)=6(2x-7)+5 5x+40=12x-42+5 5x-12x= -42+5-40 -7x=-77 x=11

解:4(x+8)÷5+8=8x÷7 4x+32÷5+8=8x÷7 4x+6.4+8=8x÷7 4x+14.8=8/7x 20/7x=14.8 x=296/7

(x+5)(x+6)(x+7)(x+8) =((x+5)(x+8)) *((x+6)(x+7)) =(x^2+13x+40)*(x^2+13x+42) =(x^2+13x)^2 +82(x^2+13x) +40*42 =(x^4 +26x^3 +169x^2) +(82x^2 +82*13x) +1680 =x^4 +26x^3 +251x^2 +1066x +1680

(x+3.7)÷4=8 解:x+3.7=8*4 x+3.7=32 x=32-3.7 x=28.3

根据6+7=5+8 6=5(-)7(+)8

(x+34)/5=7.8,只含一个未知数x,可以求出该值 x=7.8*5-34 =39-34 =5

(5.3x-5)÷7=x-8 5.3x-5= 7(x-8) 5.3x-5= 7x-56 1.7x=51 x=30

X+3/5=8 解:X=8-3/5 X=7又2/5 3/8+5/7÷2/7 =3/8+5/2 =2又7/8 3/8+5/7x1/5 =3/8+1/7 =29/56

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