问题描述:
下面各题能简算的用简便方法计算.415-176-24 | 15×27-3000÷25 | 125×89×8 | 216+64×42÷28 |
8.29+3.7+0.71+6.3 | (324-285)×12÷26 | 428×78+573×78-78. |
最佳答案:
(1)415-176-24
=415-(176+24)
=415-200
=215
(2)15×27-3000÷25
=405-120
=285
(3)125×89×8
=(125×8)×89
=1000×89
=89000
(4)216+64×42÷28
=216+2688÷28
=216+96
=312
(5)8.29+3.7+0.71+6.3
=(8.29+0.71)+(3.7+6.3)
=9+10
=19
(6)(324-285)×12÷26
=39×12÷36
=468÷36
=13
(7)428×78+573×78-78
=(428+573-1)×78
=1000×78
=78000