问题
解答题
脱式计算(能简算的要简算). (1)99×99+99 (2)[(
(3)8÷8÷0.125 (4)37×39-29×37 (5)1.8÷2.7÷0.6×2.7 (6)0.5+[
|
答案
(1)99×99+99,
=99×(99+1),
=99×100,
=9900;
(2)[(
+2.1)×3 20
]÷0.9,4 7
=[2.25×
]÷0.9,4 7
=
×9 7
,10 9
=
;10 7
(3)8÷8÷0.125,
=1÷0.125,
=8;
(4)37×39-29×37,
=37×(39-29),
=37×10,
=370;
(5)1.8÷2.7÷0.6×2.7,
=1.8×
×1 2.7
×2.7,1 0.6
=(1.8×
)×(2.7×1 0.6
),1 2.7
=3×1,
=3;
(6)0.5+[
÷(0.15+5 6
)],9 20
=0.5+[
÷5 6
],12 20
=0.5+
,25 18
=
.17 9