Simple calculation of 5.48 + 3.6 + 4.52 + 6.4

Simple calculation of 5.48 + 3.6 + 4.52 + 6.4

5.48+3.6+4.52+6.4=（5.48+4.52）+（3.6+6.4）=10+10=20

Simple calculation of 96% × 25 + 7.5 × 10% + 0.25

96%×25+7.5×10%+0.25
=96×0.25+0.25×3+0.25
=(96+3+1)×0.25
=100×0.25
=25

Simple mathematical calculation: 0.25 * 0.64 * 4 / 0.649.9 * 8 + 7.7 * 49.9 * 22 + 3.3 * 34

Simple mathematical calculation:
0.25*0.64*4/0.64
The results are as follows
==(0.25*4)0.64/0.64
==1
9.9*8+7.7*4
The results are as follows
==(10-0.1)*8+(8-0.3)*4
==80-0.8+32-1.2
==112-2
==110
9.9*22+3.3*34
The results are as follows
==(10-0.1)*22+(3+0.3)*34
==220-2.2+102+10.2
==322+8
==330

Simple mathematical operation: (2 + 4 + 6 + 8 +1996）-（1+3+5+…… +1995）

（2+4+6+8…… +1996）-（1+3+5+…… +1995）
=(2-1)+(4-3)+(6-5)+...(1994-1993)+(1996-1995)
=1+1+..+1+1
=1996/2=998