问题
解答题
脱式计算(能简便计算的要简便计算).
1.25×(0.8+8+80) |
答案
(1)
÷4 7
+11 5
×3 7 5 11
=
×4 7
+5 11
×3 7 5 11
=(
+4 7
)×3 7 5 11
=1×5 11
=
;5 11
(2)
÷[1-(5 6
+3 4
)]1 16
=
÷[1-5 6
]13 16
=
÷5 6 3 16
=
×5 6 16 3
=
;40 9
(3)1.25×(0.8+8+80)
=1.25×0.8+1.25×8+1.25×80
=1+10+100
=111.