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计算等式 [14 1 3 %(3.78%△÷1 2 7 ...

[14 1 3 -(3.78-△÷1 2 7 )×1 2 3 ]÷3.2=4 1 24 ,14 1 3 -( 189 50 -△× 7 9 )× 5 3 = 97 24 × 16 5 ,( 189 50 -△× 7 9 )× 5 3 =14 1 3 - 97 24 × 16 5 ,( 189 50 -△× 7 9 )× 5 3 = 7 5 , 189 50 -△× 7 9 = 21 25 ,△× 7 9 = 147 50 ,...

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...

120+90= 543-306= 300÷12= 120×5= 12+18+14= 62+160+38= 14×60= 203-80= 50×15×4= 175-56= 250×8= 420×20= 25+67+75= 4500÷300= 25×38= 54+97= 560÷40= 145+55= 46+49+51= 9100÷70= 103×3= 28×99= 436+208...

①15.68-(7.78-4.32)-2.32,=15.68-7.78+4.32-2.32,=(15.68+4.32)-(7.78+2.32),=20-10,=10;②0.25×3.2×1.25,=0.25×4×0.8×1.25,=(0.25×4)×(0.8×1.25),=1×1,=1;③9.99×1.01,=(10-0.01)×1.01,=10.1-0.0101,=10.0899;④4.63×1....

78×23 +23×21+ 23 =23×(78+21+1) =23×100 =2300

如图

(1)(208-179)×17,=29×17,=493;(2)64+396÷3,=64+132,=196;(3)78×(28+32),=78×60,=4680;(4)2403×0+48×34,=0+1632,=1632.

(1)(90.78-52.78÷26)×4,=(90.78-2.03)×4,=88.75×4,=355;(2)1000-450÷18×25,=1000-25×25,=1000-625,=375;(3)34÷(5?2.8÷47),=34÷(5-4.9),=34÷0.1,=7.5;(4)(334+216)÷(1.75×75%),=51112÷2116,=28463.

9.07-22.78÷3.4 =9.07-6.7 =2.37 0.25x0.89x4 =0.25×4×0.89 =1×0.89 =0.89

3.78除以2.5递等式计算 解:采用凑整法, 原式=3.78÷2.5 =3.78x4÷(2.5x4) =15.12÷10 =1.512

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