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2x45=2x(40+5)=2x40+2x5=80+10=90
84x2=2x(80+4)=2x80+2x4=160+8=168
3x25=3x(20+5)=3x20+3x5=60+15=75
23x4=4x(20+4)=4x20+4x4=80+16=96
31x5=5x(30+5)=5x30+5x5=150+25=175
13x5=5x(10+3)=5x10+5x3=50+15=65
16x4=4x(10+6)=4x10+4x6=40+24=64
25x4=4x(20+5)=4x20+4x5=80+20=100
28x6=6x(20+8)=6x20+6x8=120+48=168
19x8=8x(10+9)=8x10+8x9=80+72=152
13x7=7x(10+3)=7x10+7x3=70+21=91
54x4=4x(50+4)=4x50+4x4=200+16=216
36x5=5x(30+6)=5x30+5x6=150+30=180
77x2=2x(70+7)=2x70+2x7=104+14=118
44x3=3x(40+4)=3x40+3x4=120+12=132
MYŚLĘ ŻE POMOGŁAM :) trochę mi to czasu zajęło