=0.78× 1
=0.78.(×)
Correction:
0.78× 1.32-0.32
= 1.0296-0.32
=0.7096;
(2)3.5+2.5× 1.42
=6× 1.42
=8.52.(×)
3.5+2.5× 1.42
=3.5+3.55
=7.05.