Tính a) 3/7 . (-1/9) + 3/7 . (-2/3); b) (-7/13) . 5/12 + (-7/13)

20/27

Tính

a) 37⋅−19+37⋅−23;

b) −713⋅512+−713⋅712+−613;

c) −23+37:59+47−13:59;

d) 59:111−522+59:115−23;

e) 35+311−−37+−297−135−34+−2344.

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Giải thích

a) 37⋅−19+37⋅−23=37⋅−19+−23=37⋅−19+−69=37⋅−79=−13

b) −713⋅512+−713⋅712+−613=−713⋅512+712+−613=−713⋅1212+−613=−713+−613=−1313=−1

c) −23+37:59+47−13:59=−23+37⋅95+47−13⋅95=95⋅−23+37+47−13=95⋅−23−13+37+47

=95⋅(−1+1)=95.0=0.

d) 59:111−522+59:115−23=59:222−522+59:115−1015=59:−322+59:−915=59⋅−223+59⋅−53=59⋅−223+−53=59.−273=59⋅(−9)=−5.

e) 35+311−−37+−297−135−34+−2344=35−−37−135+311−34+−2344+−297=2135−−1535−135+1244−3344+−2344+−297=1+(−1)+−297=−297