计算下面各题,能简算的要简算.23.4-8.54-1.46 ...
计算下面各题,能简算的要简算.23.4-8.54-1.46428×78+572×78216+64×42÷28125×89×88.29+3.7+0.71+6.315×27-...
计算下面各题,能简算的要简算.23.4-8.54-1.46 428×78+572×78 216+64×42÷28 125×89×8 8.29+3.7+0.71+6.3 15×27-3000÷25.
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(1)23.4-8.54-1.46
=23.4-(8.54+1.46)
=23.4-10
=13.4;
(2)428×78+572×78
=(428+572)×78
=1000×78
=78000;
(3)216+64×42÷28
=216+2688÷28
=216+96
=312;
(4)125×89×8
=125×8×89
=1000×89
=89000;
(5)8.29+3.7+0.71+6.3
=(8.29+0.71)+(3.7+6.3)
=9+10
=19;
(6)15×27-3000÷25
=405-120
=285.
=23.4-(8.54+1.46)
=23.4-10
=13.4;
(2)428×78+572×78
=(428+572)×78
=1000×78
=78000;
(3)216+64×42÷28
=216+2688÷28
=216+96
=312;
(4)125×89×8
=125×8×89
=1000×89
=89000;
(5)8.29+3.7+0.71+6.3
=(8.29+0.71)+(3.7+6.3)
=9+10
=19;
(6)15×27-3000÷25
=405-120
=285.
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