Question

【3.94+0.86】*0.8 0.7*【3.2-2.99/2.3】 0.37*2.6+7.4*0.37 0.25*6.4/1.6*4.8 【8.1-5.4】/1.8+45.7

【能简算的用简便方法计算】

Answer 1

【3.94+0.86】*0.8
=【4+0.8】*0.8
=3.2+0.64
3.84
0.7*【3.2-2.99/2.3】
=0.7*【3.2-1.3】
=0.7*(2-0.1)
=1.4-0.07
=1.33
0.37*2.6+7.4*0.37
= 0.37*(2.6+7.4)
= 0.37*10
=3.7
0.25*6.4/1.6*4.8
= 0.25*1.6*4/1.6*4.8
=1/4.8
=5/24
【8.1-5.4】/1.8+45.7
=2.7/1.8+45.7
=1.5+45.7
=47.2

Answer 2

【3.94+0.86】*0.8
=4.8×0.8
=4.8×(1-0.2)
=4.8-4.8×0.2
=4.8-0.96
=3.84

0.7*【3.2-2.99/2.3】
=0.7×(3.2-1.3)
=0.7×1.9
=0.7×(2-0.1)
=0.7×2-0.7×0.1
=1.4-0.07
=1.33

0.37*2.6+7.4*0.37
=0.37×(2.6+7.4)
=0.37×10
=3.7

0.25*6.4/1.6*4.8
=0.25×6.4/1.6×4.8
=0.25×4×1.6/1.6×4.8
=1×1×4.8=4.8

【8.1-5.4】/1.8+45.7
=2.7/1.8+45.7
=1.5+45.7
=47.2

Answer 3

【3.94+0.86】*0.8=4.8*0.8=3.84
0.7*【3.2-2.99/2.3】=0.7*（3.2-1.3）=0.7*1.9=1.33
0.37*2.6+7.4*0.37 =0.37*（2.6+7.4）=0.37*10=3.7
0.25*6.4/1.6*4.8=0.25*（6.4/1.6）*4.8=0.25*4*4.8=1*4.8=4.8
【8.1-5.4】/1.8+45.7=2.7/1.8+45.7=1.5+45.7=47.2