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7.2一1.9+2.8 用简便方法计算

37.9-2.8-7.2+2.1 =(37.9+2.1)-(2.8+7.2) =40-10 =30 行家正解,不明白可以追问!祝您学习进步 满意请点击下面的【选为满意回答】按钮,O(∩_∩)O谢谢

1.1+1.2+1.3+1.4.......+2.5+2.6+2.7+2.8+2.9 =(1.1+2.9)×(29-11+1)÷2 =4×19÷2 =38

(1)1.25*6.4*7 =1.25*0.8*8*7 =1*56 =56 (2)9.9*7.8+0.78 =99*0.78+0.78 =0.78*(99+1) =78 (3)0.77/0.55 =0.11*7/0.11*5 =7/5 (4)7.5*1.02 =7.5*(1+0.02) =7.5+7.5*0.02 =7.2+0.15 =7.35 (5)3.7*2.8+12.5 =3.7*(3-0.2)+12.5 =11...

1.1+1.2+1.3+1.4.......+2.5+2.6+2.7+2.8+2.9 2.9+2.8+2.7+2.6+……+1.5+1.4+1.3+1.2+1.1 上下相加 每一个都是4有19个4 所以 得 4x19=76 因为有两个 所以 上面的和是 76÷2=38

(1.9-1.9x0.9)÷(3.8-2.8) =(1.9-1.71)÷1 =0.19÷1 =0.19

5.3×6.3+2.3= 4.4×7.3+5.3= 4×8.8+1.5= 4.1×0.8-0.2= 9.9×1.4+0.6= 6.4×2.4+3.6= 12.48-4×9.7= 9.8×1.3-0.3= 4.8×9.1-0.5= 4.2×1.8-0.1= 5.59-3×4.3= 3.053-0.1×5.3= 9.4×8.4+5.8= 6.908-1.3×1.6= 13.596-9.1×5.6= 11.259-2.1×7.9= 7.3+3.8×2.3=...

2.8×1.9+32.5简便方法怎么算 =2.8x2-2.8x0.1+32.5 =5.6-0.28+32.5 =32.5+6-(0.4+0.28) =38.5-0.68 =38.5-1+0.32 =37.82

1.25x0.8x8x7=1x8x7=56 (1-0.1)x7.8+0.78=7.8-0.78+0.78=7.8 7x11x100/5x11x100=7/5=1.4 7.5x(1+0.02)=7.5+0.15=7.65 (4-0.3)(3-0.2)+12.5=12-0.8-0.9+0.06+12.5=22.86

原式=9.9×2.8+2.8×0.1=2.8×(9.9+0.1)=2.8×10=28 原式=1.1×(10+0.1)=1.1×10+1.1×0.1=11+0.11=11.11

(1)721823÷9,=(72+1823)×19,=72×19+1823×19,=8+223,=8223;(2)445-(2.8÷45),=445-(245×54),=445-(2×54+45×54),=445-312,=1310;(3)1.625×3.2+5.8×158-1.625,=158×3.2+5.3×158-158×1,=158×(3.2+5.3-1),=138×152,=195...

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