解：原式=75×(10+3)+(50-2)×68
=750+225+3400-136
=750+3400+(225-136)
=4150+89
=4239.
75*13+48*68
=75*(10+3)+(50-2)68
=750+75*3+50*68-2*68
=750+225+3400-136
=975+3400-136
=4375-136
=4339
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