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1.2x2.5+0.8x2.5用简便运算和梯等式怎么算

原式=(1.2+0.8)×2.5 =2×2.5 =5

0.8×(1.25+0.125) =0.8×1.25+0.8×0.125 =1+0.1 =1.1

(1)1.5×105=1.5×(100+5)=1.5×100+1.5×5=157.5;(2)2.33×0.5×4=2.33×(0.5×4)=2.33×2=4.66;(3)24.6+18.7+15.4=24.6+15.4+18.7=40+18.7=58.7;(4)1.2×2.5+0.8×2.5=2.5×(1.2+0.8)=2.5×2=5;(5)2.05÷0.82+33.6=2.5+33.6=36.1;(6...

0.8*9+0.8*0.12=7.296

照片

175-75÷25 68+35×13 725-(125+237) (114+166)÷35 432÷(9×8) 189-60+40 三、简便计算. 216+305 25×32 47+236+64 6×(15×9) 402+359 43+78+122+257 25×(26×4) 25×44 354+(229+46) (1)9.26-4.38-2.62 (2)9.26-(4.38...

3.4×7.5+34×0.25 =3.4×7.5+3.4×10×0.25 =3.4×7.5+3.4×2.5 =3.4×(7.5+2.5) =3.4×10 =34 3.66×0.8+0.34×0.8-0.8 =(3.66+0.34-1)×0.8 =3×0.8 =2.4

7.2÷0.8-1.2×5 6.5×(4.8-1.2×4) 28-(3.4+1.25×2.4) 2.55×7.1+2.45×7.1 777×9+1111×3 (31.8+3.2×4)÷5 31.5×4÷(6+3) 0.64×25×7.8+2.2 2÷2.5+2.5÷2 194-64.8÷1.8×0.9 36.72÷4.25×9.9 5180-705×6 24÷2.4-2.5×0.8 (4121+2389)÷7 671×15-974 46...

5×0.3×0.2 5.2×6-10 6.8-0.8×4 9.8-0.6+3.2 0.6×0.5×1.13 8.25+2.4×0.5 12.8-4.8×0.25 20×1.95-1.8 7.5+2.5×5.2 102×0.45 4.3×0.25×0.4 50.8×101-50.8 7.8×0.36-0.64×7.8 8×0.9×1.25 0.4×(2.5+25) 2.4+7.6×3.4 14.25×14.6-4.25×1...

(1)0.125×0.5×0.8,=0.125×0.8×0.5,=0.1×0.5,=0.05;(2)60.4×0.8-12.8,=48.32-12.8,=35.52;(3)2.8+0.6×0.35,=2.8+0.21,=3.01;(4)0.2÷2.5,=(0.2×4)÷(2.5×4),=0.8÷10,=0.08;(5)104×0.45,=(100+4)×0.45,=100×0.45+4×...

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