问题
解答题
用递等式计算(能简算的要简算) (1)2842÷14+74×3; (2)
(3)88+99×88; (4)(
|
答案
(1)2842÷14+74×3,
=203+222,
=425;
(2)
+3 7
-5 13
+3 7
,5 13
=(
-3 7
)+(3 7
+5 13
),5 13
=0+
,10 13
=
;10 13
(3)88+99×88,
=88×(1+99),
=88×100,
=8800;
(4)(
+4 5
)÷1 4
+7 3
,7 10
=
×21 20
+3 7
,7 10
=
+9 20
,14 20
=
.23 20