1) (40÷x)×14=70
x=70÷14
x=5
x=40÷5
x=8
(40÷8)×14=70
2)280÷(x-10)=7
x=280÷7
x=40
x=40+10
x=50
280÷(50-10)=7
3)b×100+500=1000
b=1000-500
b=500
b=500÷100
b=5
5×100+500=1000
4)x+24×19=480
x=24×19
x=456
x=480-456
x=24
24+24×19=480
5) (32-k)×3=9
k=9÷3
k=3
k=32-3
k=29
(32-29)×3=9
1) (40÷x)×14=70
x=70÷14
x=5
x=40÷5
x=8
(40÷8)×14=70
2)280÷(x-10)=7
x=280÷7
x=40
x=40+10
x=50
280÷(50-10)=7
3)b×100+500=1000
b=1000-500
b=500
b=500÷100
b=5
5×100+500=1000
4)x+24×19=480
x=24×19
x=456
x=480-456
x=24
24+24×19=480
5) (32-k)×3=9
k=9÷3
k=3
k=32-3
k=29
(32-29)×3=9