简便运算要简便运算99乘4乘47 (1000减100减10)除10 19.9加19.98加19.997加19.9996
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简便运算要简便运算99乘4乘47 (1000减100减10)除10 19.9加19.98加19.997加19.9996
简便运算
要简便运算
99乘4乘47 (1000减100减10)除10 19.9加19.98加19.997加19.9996
简便运算要简便运算99乘4乘47 (1000减100减10)除10 19.9加19.98加19.997加19.9996
1、99×4×47
=(100-1)×188
=188×100-188
=18800-200+12
=48612
2、(1000-100-10)÷10
=1000 ÷10 -100÷10-10÷10
=100-10-1
=89
3、19.9+19.98+19.997+19.9996
=(20-0.1)+(20-0.02)+(20-0.003)+(20-0.0004)
=20×4-(0.1+0.02+0.003+0.0004)
=80-0.1234
=79.8766
99乘4乘47=(100-1)*4*(50-3)=(100-1)(200-12)=20000-200-1200+12=18612
(1000减100减10)除10=(10/10)/10=1/10=0.1
19.9加19.98加19.997加19.9996 =20-0.1+20-0.02+20-0.0004=60-0.1204=59.8796
99乘4乘47=(100-1)×(100-6)×2
(1000减100减10)除10=1000/10-100/10-10/10=100-10-1
19.9加19.98加19.997加19.9996 =20-0.1+20-0.02+20-0.003+20-0.0004=80-0.1234
99乘4乘47=(100-1)*4*47=(400-4)*47=18800-188=18800-200+12=18612
(1000减100减10)除10 =100-10-1=89
19.9加19.98加19.997加19.9996
=20*4-(0.1+0.02+0.003+0.0004)
=79+1-0.1234=79.8766
99乘4乘47 = 18612
(1000减100减10)除10 = 89
19.9加19.98加19.997加19.9996 = 79.8766