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脱式计算,能简算的要简算.2.31×1.5+1.5×7.69 23....

(1)2.31×1.5+1.5×7.69=(2.31+7.69)×1.5=10×1.5=15;(2)23.4÷7.8-2.1=3-2.1=0.9;(3)4.5×0.4÷4.5×0.4=4.5÷4.5×0.4×0.4=1×0.4×0.4=0.16;(4)6.4×101-6.4=6.4×(101-1)=6.4×100=640;(5)4×1.98×0.25=4×0.25×1.98=1×1.98=1.98;(6)7....

根据题意可得:(1)2.31×1.5+1.5×7.69,=(2.31+7.69)×1.5,=10×1.5,=15;(2)23.4÷7.8-2.1,=3-2.1,=0.9;(3)6.4×101-6.4,=6.4×(101-1),=6.4×100,=640;(4)4×1.98×0.25,=4×0.25×1.98,=1×1.98,=1.98.

(1)9.9+1.2-9.9+1.5=9.9-9.9+1.5+1.2=0+1.5+1.2=2.7 (2)10-3.45+2.55=6.55+2.55=9.1 (3)5.58+2.74-1.58=5.58-1.58+2.74=4+2.74=6.74 (4)1.5×10.2=1.5×10+1.5×0.2=15+0.3=15.3 (5)3.8+3.22÷23×13=3.8+0.14×13=3.8+1.82=5.62 (6)10×2....

(1)5.5×17.3+6.7×5.5=5.5×(17.3+6.7)=5.5×24=132;(2)1.5×105=1.5×(100+5)=1.5×100+1.5×5=150+7.5=157.5;(3)9.07-22.78÷3.4=9.07-6.7=2.37;(4)3.8+4.29+2.1+4.2=(3.8+4.2)+(4.29+2.1)=8+6.39=14.39;(5)2.65×1.7+1.35×1.7=...

(1)14×75-624÷39,=1050-16,=1034;(2)(7.6-3.6÷2)×1.5,=(7.6-1.8)×1.5,=5.8×1.5,=8.7;(3)45-13÷715,=45-13×157,=45-57,=335;(4)19+89×34,=19+69,=79;(5)23+(56-34)÷38,=23+112×83,=23+29,=89;(6)5.8+1.34+0....

(1)8.3-2.4×1.5,=8.3-3.6,=4.7;(2)23.4÷7.8+2.1,=3+2.1,=5.1;(3)2.5×6.3+2.5×3.7,=2.5×(6.3+3.7),=2.5×10,=25;(4)1.25×2.3×0.8,=1.25×0.8×2.3,=1×2.3,=2.3.

1、用竖式计算 0.396÷1.2= 0.756÷0.36= 15.6×13= 0.18×15= 0.025×14= 3.06×36= 0.04×0.12= 3.84×2.6≈ 5.76×3= (保留一位小数) 7.15×22 90.75÷3.3 3.68×0.25 16.9÷0.13 1.55÷3.9 3.7×0.016 13.76×0.8= 5.2×0.6 8.4×1.3 6.4×0.5 4.48×0.4 5.25...

1. 3/7 × 49/9 - 4/3 2. 8/9 × 15/36 + 1/27 3. 12× 5/6 – 2/9 ×3 4. 8× 5/4 + 1/4 5. 6÷ 3/8 – 3/8 ÷6 6. 4/7 × 5/9 + 3/7 × 5/9 7. 5/2 -( 3/2 + 4/5 ) 8. 7/8 + ( 1/8 + 1/9 ) 9. 9 × 5/6 + 5/6 10. 3/4 × 8/9 - 1/3 11. 7 × 5/49 + 3/14...

7.74×(2.8-1.3)+1.5×2.26 =7.74×1.5+1.5×2.26 =1.5x(7.74+2.26) =1.5x10 =15

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