五六年级简便计算大全带答案
1、24.6-3.98+5.4-6.02
解析:此题利用加法交换结合律,凑整再计算。步骤如下:
郑爽带孕事件24.6-3.98+5.4-6.02
=(24.6+5.4)-(3.98+6.02)
=30-10
=20
2、27×17/26
解析:此题先用加法分配律,把27转换成(26+1),再利用乘法结合律,使得运算简便。
搞笑语句27×17/26
=(26+1)×17/26
=26×17/26+1×17/26火炬之光 局域网
=17+17/26
=17又17/26
3、528-99
解析:利用凑整法和减法结合律计算,先利用凑整法把99变换为(100-1),再运用a-b-c=a-(b+c)来简便计算,步骤如下:
528-99
=528-(100-1)
=528-100+1
=428+1
=429
4、1.2×2.5+0.8×2.5
解析:运用提取公因数的方法,公式:ac+ab=a(b+c),提取公因数2.5,1.2和0.8相加正好凑整数,使得运算简便。
1.2×2.5+0.8×2.5
=(1.2+0.8)×2.5
=2×2.5
=5一尺等于多少米
5、2.96×40
解析:此题先利用乘法分配律,把2.96×40转换成29.6x4,再利用乘法结合律来简便计算。
2.96×40
=29.6x4
=(30-0.4)x4
=30×4+0.4×4
=120-1.6
=118.4
谢霆锋身高多少6、0.36 x 1.5 - 0.45
解析:此题运用乘法分配律,把0.45转换成1.5 x 0.3 ,即可提取公因数1.5,再根据乘法结合律进行简便计算。
0.36 x 1.5 - 0.45
= 0.36 x 1.5 - 1.5 x 0.3
= 1.5 × (0.36 - 0.3)
= 1.5 × 0.06
= 0.09
7、46×44/45
解析:此题先利用加法分配律把46转换成(45+1),再利用乘法结合律:(a×b)×c=a×(b×c)使得运算简便。
46×44/45
=(45+1)×44/45
=45×44/45+44/45
=44+44/45
=44又44/45
8、1.6×7.5×1.25
解析:此题利用乘法分配律把1.6,转化成2×0.8,再利用乘法结合律:(a×b)×c=a×(b×c)凑整,进行简便计算。
1.6×7.5×1.25
=2×0.8×7.5×1.25
=(2×7.5)×(0.8×1.25)
=15×1
=15
9、0.72×10.1
解析:此题先利用加法分配律,把10.1转换成10+0.1,再利用乘法结合律使得运算简便。
交强险保费0.72×10.1
=0.72×(10+0.1)
=0.72×10+0.72×0.1
=7.2+0.072
=7.272
(1)2.5*32*0.125 =(2.5*4)*(8*0.125) =10*1 =10
(2)3.5-7+6.5 =3.5+6.5-7 =3
(3)1.2×2.5+0.8×2.5 =2.5(1.2+0.8) =25
(4)8.9×1.25-0.9×1.25 =1.25(8.9-0.9) =10
(5)12.5×7.4×0.8 =12.5×0.8×7.4 =74
(6)6.5×9.5+6.5×0.5 =6.5×(9.5+0.5) =6.5×10 =65
(7)0.35×1.6+0.35×3.4 =0.35*(1.6+3.4) =0.35*5 =1.75
(8)6.72-3.28-1.72 =6.75-(3.28+1.72) =6.75-5 =1.75
(9)0.45+6.37+4.55 =0.45+4.55+6.37 =5+6.37 =11.37
(10)28×12.5-12.5×20 =(28-20)*12.5 =8*12.5 =100
(11)23.65-(3.07+3.65) =23.65-3.65-3.07 =20-3.07 =16.93
(12)(4+0.4×0.25)8×7×1.25 =(4+1)*7*10 =5*7*10 =350
(13)1.65×99+1.65 =1.65*(99+1) =1.65*100 =165
(14)27.85-(7.85+3.4) =27.85-7.85+3.4 =20+3.4 =23.4
(15)48×1.25+50×1.25×0.2×8 7.8×9.9+0.78 =7.8*(9.9+0.1) =7.8*10 =78
(16)4.8×46+4.8×54 =(46+54)*4.8 =100*4.8 =480
(17)673-327-173 =673-(327+173) =673-500 =173
(18)4.44*2.5 =1.11*(4*2.5) =1.11*10 =11.1
(19)3.5÷1.4 =(3.5÷0.7)÷(1.4÷0.7) =5÷2 =2.5
(20)1+2+3++99+100 =(1+99)+(2+98)+(3+97)+......+(49+51)+50 =(100÷2-1)*100+50 =4900+50 =4950
⑴运用加法交换律进行简便计算。 0.88+5.6+0.12 1.78+3.5+0.22 5.6+2.08+14.4 =0.88+0.12+5.6 =1.78+0.22+3.5 =5.6+14.4+2.08 =1+5.6 =2+3.5 =20+2.08 =6.6 =5.5 =22.08
⑵运用加法结合律进行简便计算 2.3+(0.56+4.7) 28.6+0.54+0.46+1.4 5.82+4.56+5.44 =(2.3+4.7)+0.56 =(28.6+1.4)+(0.54+0.46) =5.82+(4.56+5.44) =7+0.56 =30+1 =5.82+10 =7.56 =31 =15.82
⑶、运用乘法交换律进行简便计算。 25×0.37×0.4 7.5×0.39×4 6.5×1.1×4 1.25×3.9×0.8 =25×0.4×0.37 =7.5×4×0.39 =6.5×4×1.1 =1.25×0.8×3.9 =10×0.37 =30×0.39 =26×1.1 =1×3.9 =3.7 =11.7 =28.6 =3.9
⑷、运用乘法结合律进行简便计算。 1.9×7.5×8 6.2×0.8×2.5 4.3×1.5×6 4.1×3.5×2 =1.9×(7.5×8) =6.2×(0.8×2.5) =4.3×(1.5×6) =4.1×(3.5×2) =1.9×60 =6.2×2 =4.3×9 =4.1×7 =114 =12.4 =38.7 =28.7
⑸、运用乘法分配律的加法进行简算。 13.6×4.6+4.6×6.4 0.72×23+77×0.72 2.6×32+32×2.4 =(13.6+6.4)×4.6 =(23+77)×0.72 =(2.6+2.4) ×32 =20×6.4 =100×0.72 =5×32 =128 =72 =160
⑹、运用乘法分配律的减法进行简算。 12×5.9-5.9×2 4.6×2.5-2.5×0.6 101×9.7-9.7 =(12-2) ×5.9 =(4.6-0.6)×2.5 =(101-1)×9.7 =(12-2) ×5.9 =(4.6-0.6)×2.5 =(101-1)×9.7 =10×5.9 =4×2.5 =100×9.7 =59 =10 =970
⑺、运用减法的运算规律进行简便计算。 1.8-0.45-0.55 54.4-4.6-5.4 35.6-0.13-0.47 =1.8-(0.45+0.55) =54.4-(4.6+5.4) =35.6-(0.13+0.47) =1.8-1 =54.4-10 =35.6-0.6 =0.8 =44.4 =35
⑻、运用除法的运算规律进行简便计算。 4.5÷4÷7.5 14.8÷1.25÷8 18.5÷4÷1.25 5.4÷4÷0.45 =4.5÷(4×7.5) =14.8÷(1.25×8) =18.5÷(4×1.25) =5.4÷(4×0.45) =4.5÷30 =14.8÷10 =18.5÷5 =5.4÷0.18 =0.15 =1.48 =3.7 =30
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