1)
4*18:6+80=?
210:7*16:2=?
99:11*6+36=?
(77+13)*74-540=?
(4*60+240):80=?
(20*6+330):5=?
2)
12+X=7+56 96:X=6
X=? X+46=100-12
X=? X*15=60
12+?=7+56

4*18:6+80=92
210:7*16:2=240
99:11*6+36=90
(77+13)×74-540=6120
(4×60+240):80=6
(20×6+330):5=90

12+x=7+56
12+x=63
x=63-12
х=51
________
12+51=7+56
51=51

96: х=6
х=96:6
х=16
______
96:16=6
16=16
х+46=100-12
х+46=88
х=88-46
х=42
__________
42+46=100-12
42=42

х×15=60
х=60:15
х=4
_______
4×15=60
4=4