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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

(1)1.8÷0.75+9.6÷2.4,=2.4+4,=6.4;(2)6.7+ 7 8 + 9 8 +2.3,=(6.7+2.3)+( 7 8 + 9 8 ),=9+2,=11;(3)19×( 1 3 + 7 19 )×6,=19× 1 3 × 6+19× 7 19 × 6,=38+42,=80;(4) 5 7 × 15 4 +3× 5 7 + 5 12 × 3 7 ,= 5 7 ×( 15 4...

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

(2-2/3)×2/9÷4 =4/3×1/4×2/9 =1/3×2/9 =2/27

(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...

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