420:6+(700-640)*5
= 420:6 + (60)*= 70 + 30= 370
700-(810-390):7+6*60
= 700 - (420):7 + 6*6= 700 - 60 + 36= 700 - 60 + 36= 640 + 36= 1000
420:6+(700-640)*5
= 420:6 + (60)*
= 70 + 30
= 370
700-(810-390):7+6*60
= 700 - (420):7 + 6*6
= 700 - 60 + 36
= 700 - 60 + 36
= 640 + 36
= 1000