1樓:豆奶
(1)1.8×2.58+0.5+1.42×1.8=1.8×(2.58+1.42)+0.5
=1.8×4+0.5
=7.2+0.5
=7.7;
(2)(54.7-17.5)×(0.45÷0.9)=37.2×0.5
=18.6;
(3)1.5×(0.1÷0.2)-0.18÷0.36=1.5×0.5-0.5
=0.75-0.5
=0.25;
(4)93.6÷[(54.8+45.2)×(6-5.46)]=93.6÷[100×0.54]
=93.6÷54
=1.7? 3.
脫式計算.(能簡算的要簡算) 0.125×0.25×8×4 [5-1.7÷(2-1)]×1 87×386 49÷(79+49)×114
2樓:手機使用者
(1)0.125×
源0.25×8×4,
=(0.125×8)×(0.25×4),
=1×1,
=1;(2)[5-1.7÷(2-1)]×1,=[5-1.7÷1]×1,
=[5-1.7]×1,
=3.3×1,
=3.3;
(3)87×386,
=(86+1)×386,
=86×3
86+1×386,
=3+386,
=3386
;(4)4
9÷(79+4
9)×114,
=49÷119
×114,=4
11×114,
=1;(5)3.9÷1.5-2.3×0.5,=2.6-1.15,
=1.45;
(6)112÷3
4-58×1635,
=2-27,
=157.
脫式計算(能簡算的要簡算).(1)( 14-120)×40 &...
3樓:桔梗
(1)(14-1
20)×
40 =14
×40-1
20×40
=10-2
=8;(內2)5
7×34×7×2
17=(5
7×7)×(34×217)
=5×4
=20;
(3)13×3
4÷容(34-5
12) =13
×34÷13
=14÷13
=34;(4)99×97
98=98×97
98+1×97
98=97+97
98=979798.
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