How to calculate 2.7 * 6.4 + 1.3 simply

How to calculate 2.7 * 6.4 + 1.3 simply

It can't be calculated simply
It's a recursive equation
=17.28+1.3
=18.58

One quarter by 39 plus 3 / 4 by 45 plus 1 / 4 by 6, simple operation

Hello
One quarter by 39 plus three quarters by 45 plus four quarters by 6
=3/4x13+3/4x45+3/4x2
=3/4x(13+45+2)
=3/4x60
=45
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Simple calculation of 1.25 × 0.7 × 0.8

1.25×0.8×0.7=1×0.7=0.7

Can (1.5 + 1.25) × 8 be calculated simply?

（1.5+1.25）×8
=1.5*8+1.25*8
=12+10
=22