0.8×(3.2-0.4)÷0.2 12.75÷(16-7.36-3.64)簡便算灋 0.8×(3.2-0.4)÷0.2 12.75÷(16-7.36-3.64)簡便算灋

0.8×(3.2-0.4)÷0.2 12.75÷(16-7.36-3.64)簡便算灋 0.8×(3.2-0.4)÷0.2 12.75÷(16-7.36-3.64)簡便算灋

0.8×(3.2-0.4)÷0.2
=4×2.8
=11.2
12.75÷(16-7.36-3.64)
=12.75÷(16-(7.36+3.64))
=12.75÷(16-11)
=12.75÷5
=2.55