Question

1) (497+154)-(326+234)+a=266
2)a-(25×4+75):5=165
3)(14×3:6+a):2+(60:2:6+500:100)=17
4)a:(6×5:3-4×10:8)+(67-12×3:6)=17
5)[(4+4):a+4×4:2]:3=3
6)a-[50+(320:10:4+720:10:9)]:6=89
7)[(905-23×35):5×3:6]+a:6=170
8)a×4-[(360-236):4-88:8]:10=94
9)3:a+[33:3-(13-9:3)+149×1]:3=52
10)a×2+(6×3×1-18:2+99:9):5-100:10=0

Answer 1

1)651-560+a=266
91+a=266
a=266-91
a=175

2)a-(100+75):5=165
a-25:5=165
a-5=165
a=165+5
a=170

3)(42:6+a):2+(30:6+5)=17
(7+a):2+(5+5)=17
(7+a):2+10=17
(7+a):2=7
7+a=7x2=17
7+a=14
a=14-7
a=7



5)(8:a+8):3=3
8:a+8=3x3=9
8:a=9-8
8:a=1
a=8x1
a=8

6)a-[50+(32:4+72:9)]:6=89
a-[50+(8+8)]:6=89
a-(50+16):6=89
a-66:6=89
a-11=89
a=89+11
a=100

7)[(905-805):5x3:6]+a:6=170
(100:5x3:6)+a:6=170
(20x3:6)+a:6=170
(60:6)+a:6=170
10+a:6=170
a:6=170-10
a:6=160
a=160x6
a=960

le fac si pe celelalte,acum