问题
解答题
计算下面各题(能简算的要简算) ①0.25×37+
②(
③1.21×42-(4.46+
④3.5÷[1.4×(0.1-0.05) |
答案
①0.25×37+
+62÷4,1 4
=
×37+1 4
×1+62×1 4
,1 4
=(37+1+62)×
,1 4
=100×
,1 4
=25;
②(
+3 4
-5 6
)÷12,11 12
=(
-19 12
)÷12,11 12
=
÷12,8 12
=
;1 18
③1.21×42-(4.46+
),7 50
=1.21×42-4.6,
=50.82-4.6,
=46.22;
④3.5÷[1.4×(0.1-0.05)],
=3.5÷[1.4×0.05],
=3.5÷0.07,
=50.