25x(0.4x9)的简便方法
来源:学生作业帮助网 编辑:作业帮 时间:2024/09/25 08:31:26
原式=10/3*26=260/3
96*25=24*4*25=24*100=2400
25÷1.25=25×4/5=2025÷1.25=(25×8)÷(1.25×8)=200÷10=20
25*77-37*25=25*(77-37)=25*40=1000.
0.42X9.9+0.042=0.42×9.9+0.42×0.1=0.42×(9.9+0.1)=0.42×10=4.212.5X(100+0.8)=12.5×100+12.5×0.8=1250+10=
(11x9+11)X(111x999+111)x(7x11x13-1001)=(11x9+11)X(111x999+111)x0=0
56.5×9.9+56.5=56.5×(10-0.1)+56.5=565-5.65+56.5=621.5-5.65=615.85
41.2×8.1+11×9.25+53.7×1.9=41.2×8.1+11×9.25+(41.2+12.5)×1.9=41.2×8.1+41.2×1.9+11×9.25+12.5×1.9=41.2×(
7分之3x9分之5+7分之3×9分之4=7分之3x(9分之5+9分之4)=7分之3×1=7分之3
是5/17x9/24+9/17x7/24=9/17x5/24+9/17x7/24=9/17×(5/24+7/24)=9/17×1/2=9/34
48*0.1+48*9.9=48*(0.1+9.9)=480
拆成13,9x9,9+13,9x0,1再答:不用谢
2.5x3.2x1.25=2.5×4×0.8×1.25=10×1=101.98x9.9=1.98×(10-0.1)=19.8-0.198=19.602
0.8x[13-(3.12+5.28)]=0.8x[13-9]=0.8x4=3.2
23/25÷(3/4+2/5)=23/25÷23/20=23/25×20/23=4/51/7×9/13÷5/14÷3/13=1/7×9/13×14/5×13/3=6/5=1又1/515/16÷(5/1
3.9*9.9+3.9*0.1=3.9*(9.9+0.1)=39
25×9.2-1.25×1.2=25×4×2.3-1.25×0.8×1.5=100×2.3-1×1.5=230-1.5=230-2+0.5=228.5
3.228x(-9)+(-3.272)x9-(-1.5)x9=-3.228x9-3.272)x9+1.5x9=(-3.228-3.272+1.5)x9=5x9=4511.35x(-2/3)²
25×36=25×4×9=100×9=900