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脱式计算(能简算的要简算,并写出主要过程)125×4...

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...

(1)0.125×0.25×8×4=0.125×8×(0.25×4)=1×1=1;(2)6.6×12+8×6.6=(12+8)×6.6=20×6.6=132.

(1)0.125×4.78×80 =0.125×80×4.78=10×4.78=47.8; (2)(0.4+40)×2.5 =0.4×2.5+40×2.5=1+100=101; (3)6.9×87+6.9×14-6.9=6.9×(87+14-1)=6.9×100=690.

(1)25×18×4=25×4×18=100×18=1800;(2)125×12×8 =125×8×12=1000×12=12000;(3)169+78+22=169+(78+22)=169+100=269;(4)45×38+45×62=45×(38+62)=45×100=4500;(5)(277+187)÷58=464÷58=8;(6)360÷(12+6)×5=360÷18×5=20×5=100.

960+320 ÷16—38 =960+20—38 =942

(1)49×102-2×49=49×(102-2)=49×100=4900;(2)125×76×8=125×8×76=1000×76=76000;(3)8.33-2.43-4.57=8.33-(2.43+4.57)=8.33-7=1.33;(4)103×32=(100+3)×32=100×32+3×32=3200+96=3296;(5)36×99+36=36×(99+1)=36×100=3600;(6...

(1)4.57+3.34÷0.2=4.57+16.7,=21.27;(2)1.68÷0.25÷0.4=1.68÷(0.25×0.4),=1.68÷0.1,=16.8;(3)2.5×0.7+7.5×0.7=(2.5+7.5)×0.7,=10×0.7,=7;(4)0.125×0.32×0.25=(0.125×0.8)×(0.4×0.25)=0.1×0.1,=0.01.

42×125×8×5 =(42x5)x(125x8) =210x1000 =210000 23×5×2 =23x(5x2) =23x10 =230 25×9×4 =(25x4)x9 =100x9 =900 15×162×2 =(15x2)x162 =30x162 =4860 (250×125)×(4×8) =(250x4)x(125x8) =1000x1000 =1000000 供参考。

分别是119,1486,184,18,691.24

(0.125×8-0.5)×4 =(1-0.5)*4=0.5*4=2 105×8.6-8.6×4-8.6=(105-4-1)*8.6=100*8.6=860 1.8+18÷1.5-0.5×0.3 =1.8+12-0.15=13.65 (0.62+7.638÷0.1)÷0.25=(0.62+76.38)/0.25=77/0.25=308

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