几道数学题目 求答案

5001-247-1021-232
=5001-(247+1021+232)
=5001-1500
=3501
276+228+353+219
=276+(228+353+219)
=276+800
=1076
1883-398
=1883-383-15
=1500-15
=1485
75×24
=75×2×12
=150×12
=1800
50×（34×4）×3
=50×4×34×3
=200×102
=20400
25×（24+16)
=25×4×6+25×4×4
=600+400
=1000
178+99+178
=178×2+99
=356+99
=356+100-1
=455

1.5001-247-1021-232 =5001-(247+1021+232)=5001-200=3501
2.276+228+353+219 =276+(288+353+219)=276+800=1076
3.1883-398 =1883+2-400=1885-400=1485
4.75×24=75×(20+4)=75×20+75×4=1800
5.50×（34×4）×3=20400
6.25×（24+16）=25×40=1000
7.178+99+178=1355

1.5001-(247+1021+232)