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7.2 ÷1.8(3.4%2.9)用脱式计算

解:依题意得算式, 7.2÷1.8×(3.4-2.9) =4×0.5 =2 7.2÷1.8×(3.4-2.9)=2

直接用通分法即可: 原式=(3/8+1/4)+3/7-2/9 =(3+2)/8+3/7-2/9 =5/8+3/7-2/9 根据7,8,9最小公倍数是7×8×9=504 =(5×63+3×72-2×56)/504=419/504

3/4×(9/8)+0.75÷8/7+2÷(4/3) =3/4×(9/8)+3/4x7/8+2x3/4 =3/4x(9/8+7/8+2) =3/4x(2+2) =3/4x4 =3 谢谢,请采纳

7/9÷2/3+2/9 =7/9×3/2+2/9 =7/6+2/9 =21/18+4/18 =25/18

4÷2/3÷9/20 =6÷9/20 =13又3分之1 你好,本题已解答,如果满意 请点右下角“采纳答案”。

脱式计算 能简算就简算 2.8-5又4/9+7.2-3又5/9 =(2.8+7.2)-(5又4/9+3又5/9 ) =10-9 =1

(1)25×4.4,=25×4+25×0.4,=100+10,=110;(2)7.7×0.16÷7.7×12.5,=7.7÷7.7×0.8×0.2×12.5,=1×0.2×12.5×0.8,=0.2×10,=2;(3)10.64÷(3.7-2.9),=10.64÷0.8,=13.3;(4)4.8×99+4.8,=4.8×(99+1),=4.8×100,=480;(5)47.3+21×(3...

(1) 5 9 ×{1÷( 7 8 - 3 4 )}= 5 9 ×{1÷( 21 24 - 18 24 )}= 5 9 ×{1÷ 1 8 }= 5 9 ×8=4 4 9 ;(2)1.25×32×2.5=(1.25×8)×(4×25)=10×100=1000;(3)(3.8-1.8÷2)×0.5=(3.8-0.9)×0.5=2.9×0.5=1.45;(4) 7 15 ×9-6÷ 15 7 = 7 15 ×...

(1)2007-6×308 =2007-1848=159(2)1750-999-99-9 =1750-(1000-1)-(100-1)-(10-1)=1750-1000-100-10+3=750-100-10+3=650-10+3=640+3=643(3)0.7+3.9+4.3+6.1=(0.7+4.3)+(3.9+6.1)=5+10=15(4)3.6÷(7.2-4×1.5)=3.6÷(7.2-6)=3.6...

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