Question

计算各题，能简算的要简算。 （1）31.5-18.54/1.8 (2)1.82/(0.13*0.7) (3)2.7*(3.85-13.*1.5)

(4)(28.26-15.7)/3.14+2.81

Answer 1

1、原式=31.5-（18+0.54）/1.8=31.5-10-0.3=21.2
2、原式=14/0.7=20
3、原式=2.7×（3.85-19.5）=2.7×（-15.65）=-42.255
4、原式=9-5+2.81=4+2.81=6.81

Answer 2

1.=31.5-（18+0.54）/1.8=31.5-10-0.3=21.2
2=14/0.7=20
3=2.7×（3.85-19.5）=2.7×（-15.65）=-42.255
4=9-5+2.81=4+2.81=6.81

Answer 3

1= (31+0.5) - (18/1.8 + 0.54/1.8)=31 +0.5 -10 -0.3 =21 + 0.2=21.2
2=1820/(13*7)=1820/91=20
3=3*(1-0.1) * (4-0.15-(10+3)*1.5) = 3*0.9*(-11-0.15-4.5)=3*0.9*(-16.35)=-1.635*3*9=