600 * 800 / 20 = 480000 / 20 = 24000 (24000)
4(3-х)-11=7(2х-5)
12-4х-11=14х-35
12-11+35=14х+4х
36=18х
х=36:18
х=2
(3х+у)-(-х-4у)=3х+у+х-4у=4х^2-3 у
(з+6у)-(8х-7у)=х +6у-8х+7у=-7у+13у^2
(m+n)-(m-n)=m +n-m+n=0
<span>Упростите выражение:
a) 8+7k-3k+k-11k=
8-6kб) 4(c-1)-7(c+5)-2(3c+8) = 4c-4-7c-35-6c-16=4c-7c-6c-4-35-16=
-9c-55= -(9c+55)в)
*(6,5n - <span>3
</span>*m) +3,2*(
*n-0,5m)= <span>
*6,5n - </span>
*<span>3
*m +3,2*</span><span>
*n - 3,2*0,5m = </span>
*<span><span>
*</span>n -
*
*m +</span><span>
*
*n - 1,6m = </span><span>
n - m + </span><span>
n - 1,6m = 2n+2n-m-1,6m
=4n-2,6m</span>
</span>