Question

Tính nhanh 

125.13-125+125.188                   b) 526+892

c) 4.15.36+12.5.25+10.39.6                        d) 3.25.8+4.37.6+2.38.12

e) 1+5+9+....+435+439                                 f) 25.98

g) 49634- 2997                                 h) 2400:(50.24)

i)(3600.180): 36                                 j) 37.7+80.3+43.7

 

 

Answer 1

a,125.13-125+125.188=125.(13-1+188)=125.200=25000

Answer 2

b,526+892=518+(8+892)=518+900=1418

Answer 3

125.13-125+125.188=125.(13-1+188)=125.200=2500

526+892=(418+108)+892=418+(108+892)=418+1000=1418

4.15.36+12.5.25+10.39.6=60.36+60.25+60.39=60.(36+25+39)=60.100=6000

3.25.8+4.37.6+2.38.12=24.25+24.37+24.38=24.(25+37+38)=24.100=2400

câu e bị sai đề( do sai lệch khoảng cách:1 chia 4 dư 1, 439 chia 4 dư 3 suy ra không đều về khoảng cách)

25.98=25.2.49=50.49=2450

49634-2997=49634-3000+3=46634+3=46637

2400:(50.24)=2400:24:50=100:50=2

(3600.180):36=3600:36.180=100.180=18000

37.7+80.3+43.7=7.(37+43)+80.3=7.80+80.3=80.(7+3)=80.10=800

Học tốt!

Answer 4

c,4.15.36+12.5.25+10.39.6=60.36+60.25+60.39=60.(36+25+39)=60.100=6000

d,3.25.8+4.37.6+2.38.12=24.25+24.37+24.38=24.(25+37+38)=24.100=2400

Answer 5

e sai đề

Answer 6

f, 25.98=25.(100-2)=2500-50=2450

g,49634-2997=49634-3000+3=46634+3=46637

h, 2400:(50.24)=2400:120=20

i,3600.180:36=3600:36.180=100.180=18000

j,37.7+80.3+43.7=7(37+43)+80.3=7.80+3.80=80.(3+7)=80.10=800