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b) 8x41= 8x40+8x1= 320+8= 328
c) 45x6= 40x6+ 5x6= 240+30= 270
d)50x123= 50x100+ 50x20+50x3=5000+1000+150=6150
e)1200:25=1000;25+200;25= 40+8=48
f.)952:4=900;4+52;4=225+13=238
g)6400;50=6000;50+400;50=120+8=128
h.)840;5=800;5+40;5=160+8=168
Proszę! :D