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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

(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...

解: 4.2+0.8-4.2+0.8 简便计算如下: 4.2+0.8-4.2+0.8 =(4.2-4.2)+(0.8+0.8) =0+1.6 =1.6

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...

照片

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

(10-6.35×0.8)×0.5 =10X0.5-6.35X0.8X0.5 =5-6.35X0.4 =5-2.54 =2.46

68.8÷(1.25×8) =68.8÷10 =6.88 0.68×(6.2-5.2) =0.68×1 =0.68

(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×...

(1)0.11×1.8+8.2×0.11,=0.11×(1.8+8.2),=0.11×10,=1.1;(2)0.8×(3.2-2.99÷2.3),=0.8×(3.2-1.3),=0.8×1.9,=1.52;(3)3.5-3.5×0.98,=(1-0.98)×3.5,=0.02×3.5,=0.07;(4)12.5×2.5×3.2,=12.5×2.5×4×0.8,=12.5×0.8×(2.5×...

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