de ma lam di

a, 125 + 70 + 37 + 230
= (125+37) + (70+230)
= 162 + 300
= 462
b, 11.25 + 95.11 + 89.51 + 69.89
= 11.(25+95) + 89.(51+ 69)
= 11.120 + 89.120
= 120.(11+89)
= 120.100
= 1200
d) 2.3^2+4.3^3
= 2.9 + 2.9.2.3
= 18 + 18.6
= 18.(6+1)
= 18.7
= 136

a)125+70+37+230=(125+37)+(70+230)=162+300=462
b)11.25+95.11+89.51+69.89=11.(25+95)+89.(51+59)=1320+9790=11110
c)520:{[(16.5+2mũ2.5):5-5]+115}+2017mũ0
=520:{[100:5-5]+115}+2017mũ0
=520:{15+115}+2017mũ0
=520:120+2017mũ0
=5,3333
d)2.3mũ2+4.3mũ3
=18+108
=126

c) 520 : {[(16.5 + 2^2.5) : 5 - 5] + 115} + 2017^0
= 520 : [(16 + 2^2 - 5)+ 115] + 1
= 520 : ( 16 + 4 - 5 + 115) + 1
= 520 : 130 + 1
= 4 + 1 = 5
d) 2.3^2 + 4.3^3
= 2.9 + 4.27
= 18 + 108
= 126