Question

数学四年级题目

简便计算:0.56乘99+0.56
10.25+2.5+25乘0.4
64乘3.28+4.6乘3.28-3.28
3.5乘5+8乘3.5
25乘0.32

在线等,求高手！！！ 感激不尽！

Answer 1

简便计算:
1、
0.56×99+0.56=0.56×（99+1）=0.56×100=56
2、
10.25+2.5+25×0.4=10+0.25+2+0.5+5×0.2×5×2=12+0.75+1×10=22+0.75=22.75
3、
64×3.28+4.6×3.28-3.28
=（3+0.2+0.08）×8×8+（3+0.2+0.08）×4+（3+0.2+0.08）×0.6-3-0.28
=（24+1.6+0.64）×8+12+0.8+0.32+1.8+0.12+0.048--3-0.28
=（20+4+1+0.6+0.6+0.04）×8+9+2.6+0.488-0.28
=160+32+8+4.8+4.8+0.32+9+2.6+0.208
=192+8+4+0.8+4+0.8+0.32+9+2+0.2+0.2+0.2+0.208
=192+10+8+1.+1+0.32+9+0.2+0.208
=202++8+1.+0.32+10+0.408
=220+1.+0.728=221.728
4、
3.5×5+8×3.5
=（3+0.5）×5+8×（3+0.5）
=15+2.5+24+4
=15+2+0.5+20+4+4
=15+0.5+20+10
=45+0.5=45.5
5、
25×0.32
=5×5×（0.3+0.02）
=5×（1.5+0.1）
=5×（1+0.5+0.1）
=5+2.5+0.5
=5+2+0.5+0.5
=5+2+1=8

Answer 2

1.=0.56×（99+1）=0.56*100=56
2.10.25+2.5+25*0.4=12.75+10=22.75
3.=3.28×（6.4+4.6-1）=32.8
4.=3.5×（5+8）=3.5×10+3.5×3=45.5
5.25×0.32=25×0.4×0.8=10×0.2=8

Answer 3

0.56乘99+0.56=0.56*100=56
10.25+2.5+25乘0.4=12.75+10=22.75
64乘3.28+4.6乘3.28-3.28=3.28*(64+4.6-1)=3.28*67.6(打错了吧？应该是6.4吧，3.28*67.6的结果请自算)
3.5乘5+8乘3.5=3.5*13=45.5
25乘0.32=25*0.4*0.8=8

Answer 4

0.56×（99+1）=56
22.75
(64+4.6-1)×3.28=221.728
3.5×13=45.5
25×0.4×0.8=8

Answer 5

1, 55.7536 2, 6.1 3, 0 4, 45.5 5, 8