问题
解答题
怎样简便就怎样算. (1)8470-104×65 (2)1.3-3.79+9.7-6.21 (3)3.64÷4+4.36×0.25(4)(
(5)
|
答案
(1)8470-104×65
=8470-6760
=1710;
(2)1.3-3.79+9.7-6.21
=1.3+9.7-(3.79+6.21)
=11-10
=1;
(3)3.64÷4+4.36×0.25
=3.64×0.25+4.36×0.25
=(3.64+4.36)×0.25
=8×0.25
=2;
(4)(
-1 9
)×4×91 12
=(
-1 9
)×361 12
=
×36-1 9
×361 12
=4-3
=1;
(5)
÷[9 20
×(0.4+3 2
)]4 5
=
÷[9 20
×(3 2
+2 5
)]4 5
=
÷[9 20
×3 2
]6 5
=
÷9 20 9 5
=
;1 4
故答案为1710;1;2;1;
.1 4