问题
解答题
简便计算
|
答案
(1)43×99+43,
=43×(99+1),
=43×100,
=4300;
(2)
-3 7
+2 5
-4 7
,3 5
=(
+3 7
)-(4 7
+2 5
),3 5
=1-1,
=0;
(3)
×5 12
-1 13
÷13,1 4
=
×5 12
-1 13
×1 4
,1 13
=(
-5 12
)×1 4
,1 13
=
×1 6
,1 13
=
;1 78
(4)3.5×98+35×0.2,
=3.5×98+3.5×2,
=3.5×(98+2),
=3.5×100,
=350;
(5)250×
+250×1 5
,4 5
=250×(
+1 5
),4 5
=250×1,
=250;
(6)
×12.5×11 3
×8,9 10
=(
×11 3
)×(12.5×8),9 10
=
×100,33 10
=330.