五年级上册数学简便计算9.6*3.6+7.2*0.2 2.72-3.97+5.38-2.039.6*3.6+7.2*0.2 2.72-3.97+5.38-2.03
问题描述：
五年级上册数学简便计算9.6*3.6+7.2*0.2 2.72-3.97+5.38-2.03
9.6*3.6+7.2*0.2 2.72-3.97+5.38-2.03
答
3.6(10-0.4)+(7+0.2)0.2=36*(4-0.4)+1.4+0.04=(40-4)*4-0.4(40-4)+1.44=160-16+0.1(160-16)+1.44=144+14.4+1.44=149.84 太麻烦了 根本就没用这个 还不如拿计算器算得了
答
9.6*3.6+7.2*0.2
=9.6*3.6+3.6*0.4
=3.6*(9.6+0.4)
=3.6*10=36
2.72-3.97+5.38-2.03
=(2.72+5.38)-(3.97+2.03)
=8.10-6.00=2.10
答
9.6*3.6+7.2*0.2=9.6*3.6+3.6*2*0.2=3.6*（9.6+2*0.2）=3.6*10=36
2.72-3.97+5.38-2.03=2.72+5.38-3.97-2.03=（2.72+5.38）-（3.97+2.03）=8-6=2
答
9.6*3.6+7.2*0.2
=9.6x3.6+3.6x2x0.2
=3.6x(9.6+0.4)
=3.6x10
=36
2.72-3.97+5.38-2.03
=(2.72+5.38)-(2.03+3.97）
=8.1-6
=2.1