49×102-2×49
=49×(102-2)
=49×100
=4900;
125×76×8
=125×8×76
=1000×76
=76000;
8.33-2.43-4.57
=8.33-(2.43+4.57)
=8.33-7
=1.33;
103×32
=100×32+3×32
=3200+96
=3296;
41000÷8÷125
=41000÷(8×125)
=41000÷1000
=41;
5824÷8×(85-78)
=728×7
=5096;
840÷28+70×18
=30+1260
=1290.