问题
解答题
脱式计算(能简便计算的要简算) 10.28+0.98+79.72+10.02 2700×(506-499)÷900 (
(0.65+
|
答案
(1)10.28+0.98+79.72+10.02,
=(10.28+79.72)+(0.98+10.02),
=90+11,
=101;
(2)2700×(506-499)÷900,
=2700×7÷900,
=2700÷900×7,
=3×7,
=21;
(3)(
+4 9
+5 12
)×367 18
=
×36+4 9
×36+5 12
×367 18
=16+15+14
=45;
(4)(0.65+
)÷7 20
×4.85 6
=(0.65+0.35)×
×4.86 5
=1×1.2×4.8
=5.76.