The following questions, how simple on how to calculate Formula: 1, 0.76x4.2 + 3.1x4 2, 290.7-22.78 △ 3.1-33 3, 1.4x8.6 + 8.6x8.6 4, 0.24x2.5x12.5

The following questions, how simple on how to calculate Formula: 1, 0.76x4.2 + 3.1x4 2, 290.7-22.78 △ 3.1-33 3, 1.4x8.6 + 8.6x8.6 4, 0.24x2.5x12.5

1、0.76x4.2+3.1x4=3.192+12.4=15.5922、290.7-22.78÷3.1-33=290.7-7.348-3=250.3523、1.4x8.6+8.6x8.6=8.6*(1.4+8.6)=864、0.24x2.5x12.5=0.4x2.5x12.5x0.6=1x7.5=7.5

The following questions are as simple as they are
0.85*101-0.85 3.6/4-0.12*5 (3.95-3.68)/9 4.8*5-6.6

0.85*101-0.85
=0.85*(101-1)
=0.85*100
=85
3.6/4-0.12*5
=0.9-0.6
=0.3
(3.95-3.68)/9
=0.27/9
=0.03
4.8*5-6.6
=4.8*10/2-6.6
=48/2-6.6
=24-6.6
=17.4