Question

谁来帮我解决这三道数学题?用简便计算：10.5÷3.5÷3 4.2×9.1+42×0.09 16×0.25

Answer 1

10.5÷3.5÷3

=10.5÷(3.5×3)

=10.5÷10.5

=1

4.2×9.1+42×0.09

=4.2×9.1+4.2×0.9

=4.2×(9.1+0.9)

=4.2×10

=42

16×0.25

=4×4×0.25

=4×(4×0.25)

=4×1

4