Question

50道七年级上学期计算题

要附过程和答案！！

Answer 1

｛3x+4y=5 {x=1
-7x+9y=-2/5 y=0.5
{x+y=35 {x=23
2x+4y=94 y=12
{x+y=7 {x=4
900x=1200y y=3
{2(2x+5y)=3.6 {x=0.4
5(3x+2y)=8 y=0.2
{3(x-1)=y+5 {x=5
5(y-1)=3(x+5) y=7
{2x/3+3y/4=1/2 {x=-1.5
4x/5+5y/6=7/15 y=2
{30x+15y=675 {x=20
(30+12)x+(15+5)y=940 y=5
{x/3+y/4=9/10 {x=1.5
x/5+y/4=7/10 y=1.6
{60x+30y=1080 {x=16
50x+10y=840 y=4
来不及算哦。。自己去算
{x-y=13 ｛x=17
x=6y-7 y=4
{x-y=4 {x=7/6
4x+2y=-1 y=-17/6
{5x-y=110 {x=20
9y-x=110 y=-10
{3x+y=11 {x=-22
-4x-y=11 y=7
{4x+y=15 ｛
3y-4x=-3
{1/2x+3y=-6
1/2x+y=2
{4(x-y-1)=3(1-y)-2
x/2+y/3=2
{2(x-y)/3-x+y/4=-1
6(x+y)-4(2x-y)=16
{2x+y=15
x+2y=18
{5x+y=3
x+5y=2
不等式
x+3＞-1
6x＜6x-7
-1/3x＜2/3
4x＞-12
2x＞1-x
x+2＜4x-1
x-5＞1+2x
3x+2＜4x
2/3x+5＞1-x
x-1＜3/4x-1/8
7（x+3）＞98
20（1.1+x）≤1.1X30
x-3(x-2)≥4
2x-1/5＞x+1/2
1/2(x+4)＜2
x+2/2＞x+3/3
自己去算哦 自己都很容易的 很基础的