问题
解答题
用简便方法计算.
|
答案
(1)1.25×88,
=1.25×8×11,
=10×11,
=110;
(2)0.91×99+0.91,
=0.91×(99+1),
=0.91×100,
=91;
(3)
×7.7+2.3÷4 5
,5 4
=
×7.7+2.3×4 5
,4 5
=
×(7.7+2.3),4 5
=
×10,4 5
=8.
用简便方法计算.
|
(1)1.25×88,
=1.25×8×11,
=10×11,
=110;
(2)0.91×99+0.91,
=0.91×(99+1),
=0.91×100,
=91;
(3)
×7.7+2.3÷4 5
,5 4
=
×7.7+2.3×4 5
,4 5
=
×(7.7+2.3),4 5
=
×10,4 5
=8.