3.78×0.5-0.65?

=3.78×0.5- 1.3×0.5?

=(3.78- 1.3)×0.5?

=2.48×0.5?

= 1.24

Multiplication operation properties:

Multiply the product of several numbers by a number so that any factor in the product can be multiplied by this number and then multiplied by other numbers. For example: (25×3 × 9)×4=25×4×3×9=2700.

Multiply a number by the difference between two numbers. You can multiply this number by the minuend and the minuend respectively, and then subtract the product. For example: (137-125) × 8 =137× 8-125× 8 = 96.