问题
解答题
用递等式计算,能简算的要简算. (1)46×8-120÷15 (2)
(3)(12.5×8-40)÷0.6 (4)
(5)3.4×2.77+0.23×3.4 (6)(
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答案
(1)46×8-120÷15,
=368-8,
=360;
(2)
+23 4
+9 17
+31 4
,8 17
=(
+3 4
)+(21 4
+39 17
),8 17
=1+6,
=7;
(3)(12.5×8-40)÷0.6,
=(100-40)÷0.6,
=60÷0.6,
=100;
(4)
+(2 3
-4 5
)×2 3
,5 3
=
+2 3
×2 15
,5 3
=
+2 3
,2 9
=
;8 9
(5)3.4×2.77+0.23×3.4
=(2.77+0.23)×3.4,
=3×3.4,
=10.2;
(6)(
+5 12
+1 9
)×723 8
=
×72+5 12
×72+1 9
×72,3 8
=30+8+27,
=65.