用简便方法计算. 7.85+6.76+2.15 18.43-3.76-7.24 21.65+(4.8-3.65) 9.64-(4.64-1.23)
用简便方法计算. 7.85+6.76+2.15 18.43-3.76-7.24 21.65+(4.8-3.65) 9.64-(4.64-1.23)
(1)7.85+6.76+2.15
=7.85+2.15+6.76,
=10+6.76,
=16.76;
(2)18.43-3.76-7.24
=18.43-(3.76+7.24),
=18.43-11,
=7.43;
(3)21.65+(4.8-3.65)
=21.65-3.65+4.8,
=18+4.8,
=22.8;
(4)9.64-(4.64-1.23)
=9.64-4.64+1.23,
=5+1.23,
=6.23;
(5)2.7+17.6+3.3-5.6
=2.7+3.3+(17.6-5.6),
=6+12,
=18;
(6)9.87-3.5+2.13-8.5
=9.87+2.13-(3.5+8.5),
=12-12,
=0.
9.64-(1.64+2.9)怎样简便计算?
9.64-(1.64+2.9)怎样简便计算?
9.64-(1.64+2.9)
=9.64-1.64-2.9
=8-2.9
=5.1
4.8-3.65 5.2-1.35简便运算
4.8-3.65+5.2-1.35
=(4.8+5.2)-(3.65+1.35)
=10-5
=5
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57.85-7.85+2.15用简便计算
57.85-7.85+2.15
=(57.85+2.15)-7.85
=60-7.85
=52.15
3.76×88用简便方法计算
3.76×88用简便方法计算
3.76×88
=3.76×(80+8)
=3.76×80+3.76×8
=300.8+30.08
=330.88
9.64*2.1-9.64*1怎样用简便方法计算
参考答案:
9.64×2.1-9.64×1
=9.64×(2.1-1)
=9.64×1.1
=9.64+0.964
=10.604
用简便方法计算:3.24-1.69+6.76
用简便方法计算:3.24-1.69+6.76
=(3.24+6.76)-1.69
=10-1.69
=8.31
0.87*3.16+4.64=用简便方法计算
0.87*3.16+4.64=?简便方法计算是:
0.87*3.16+4.64
=3.16+4.64-0.13*3.16
=7.8-0.4108
=7.3892
用简便方法计算0.47×1.63+4.64
用简便方法计算
0.47×1.63+4.64
=0.7661+4.64
=5.4061
9.64×2.7-5.64×2.7用简便方法计算
9.64×2.7-5.64×2.7
=2.7*(9.64-5.64)
=2.7*4
=10.8