If '-' means '+', '+' means '×', '×' means '-', then which of the following is not correct? 45 + 9 - 3 × 15 ÷ 2 |
22+7-3×9=148 33×5-10+20=228 7+28-3×52=127 44-9+6×11=87 |
7+28-3×52=127 |
For option (1) 22+7-3×9= 22×7+3-9 = 154+3-9 =157-9 = 148 = RHS For option (2) 33×5-10+20= 33-5+10×20 = 33-5+200 = 233-5 =228= RHS For option (3) 7+28-3×52= 7×28+3-52 = 196+3-52 = 199-52 = 147 ≠ RHS For option (4) 44-9+6×11= 44+9×6-11 = 44+54-11 = 98-11 = 87 = RHS |