求未知数x.
![]() ![]() | ![]() ![]() ![]() ![]() | 100÷10%x=20. |
25×4= | 31×30= | 18×4= | 300×8= | 70×11= |
120×7= | 130×5= | 60×11= | 100×24= | 24×4= |
16×4= | 75×3= | 25×2= | 2×310= | 70×13= |
21×60= | 55×2= | 450×3= | 360×5= | 48×7= |
45×20= | 17×9= | 32×5= | 98×2= | 210×6= |
2370+1995= | 3999+498= | 1883-398= | 158+262+138 | 388+(5000-1000)= |
375+219+381+225= | 5001-247-1021-232= | (181+2564)+2719= | 378+44+114+242+222= | (375+1034)+(966+125)= |
(2130+783+270)+1017= | 7755-(2187+755)= | 2214+638+286= | 3065-738-1065= | 899+344= |
2357-183-317-357= | 2365-1086-214= | 497-299= | 2370+1995= | 3999+498= |