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脱式计算,能简算的要简算,需要过程

650÷25+26×99 =26+26x99 =26x(1+99) =26x100 =2600 如有帮助请采纳, 如对本题有疑问可追问,Good luck!

(1)2.5×7.1×4=(2.5×4)×7.1=10×7.1=71(2)16.12×99+16.12 =16.12×(99+1)=16.12×100=1612(3)5.2×0.9+0.9×4.8=(5.2+4.8)×0.9=10×0.9=9(4)26×15.7+15.7×24 =(26+24)×15.7=50×15.7=785(5)(2.275+0.625)×0.28=2.9×0.28=0.812(6)6...

(1)3.58-2.36-(2.64-1.42)=3.58-2.36-2.64+1.42=(3.58+1.42)-(2.36+2.64)=5-5=0;(2)(14+16?13)×12=14×12+16×12-13×12=3+2-4=1;(3)3.6×118+8.4÷811=3.6×118+8.4×118=(3.6+8.4)×118=12×118=332;(4)34÷[3.75×(1.2?15)]=34÷[3.75×1...

(1)37-35+47+0.4=37+47-35+25,=1-35+25,=45;(2)1689÷8=(16+89)×18,=16×18+89×18,=2+19,=219;(3)(6.9-3.15)÷0.3×0.8=3.75÷0.3×0.8,=12.5×0.8,=10;(4)2.5×(1.9+1.9+1.9+1.9)=2.5×(4×1.9),=2.5×4×1.9,=10×1.9,=19.

解(1)20-9.18-0.82,=20-(9.18+0.82),=20-10,=10.(2)6.53-(1.53+2.6),=6.53-1.53-2.6,=4-2.6,=1.4.(3)5.52-1.074-0.926,=5.52-(1.074+0.926),=5.52-2,=3.52.(4)4.21+1.04+0.79,=4.21+0.79+1.04,=5+1.04,=6.04.

①(84×27-2166)÷17,=(2268-2166)÷17,=102÷17,=6;②115×3.7+5.3÷511+2.2,=2.2×3.7+5.3×2.2+2.2,=2.2×(3.7+5.3+1),=2.2×10,=22;③(0.75÷3-0.1)×(1-23),=(0.25-0.1)×13,=0.15×13,=0.05.

第一题=3/4乘以5/7乘以4/3减去1/2=5/7减去1/2=分子:10减去7 分母:14=3/14 第二题=3.14乘以16减去3.14乘以6=3.14乘以(16减去6)=3.14乘以10=31.4 第三题=10减去【1/5减去(7/20减去1/10)乘以1/5】=10减去1/5乘以【1减去(7/20减去1/10)】=10...

①4.5×102, =4.5×(100+2), =4.5×100+4.5×2, =450+9, =459; ②0.85×6.7+3.3×0.85, =(6.7+3.3)×0.85, =10×0.85, =8.5; ③0.25×4.87×4, =(0.25×4)×4.87, =1×4.87, =4.87; ④25.8-1.58×0.65, =25.8-1.027, =24.773. 原理及解决简...

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