a) 4x12x25-5x112x20
=100*12-100*112
=100*100=10000
b) 54x113+45x113+113
=113(54+45+1)
=113x100
=11300
c) không rõ đề
d) 1875:2+125:2
=(1875+125)/2
=2000/2
=1000
b) 54x113+45x113+113=113x(54+45+1)=113x100=11300
d) 1875:2+125:2=(1875+125) :2=2000:2=1000
a)4x113x25-5x112x20=4x25x113-5x20x112=100x113-100x112=100x(113-112)=100x1=100
a)4x113x25-5x112x20 54x113+45x113+113 =54x113+45x113+113x1
=113x(54+45+1)
=113x100=11300
= 4x25x113-5x20x112
=100x113-100x112
=100x(113-112)
=100x1
=100