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计算下面各题,能用简便算法的要用简便法计算. ...

15.7 - ( 5.7 - 2.8 ) = 15.7 - 5.7 + 2.8 = 12.8 4/9 - 7/16 * 4/9 = 4/9 * 1 - 7/16 * 4/9 = 4/9 * (1 - 7/16) = 4/9 * 9/16 = 1/4 (3/4 - 5/7 )/ (1/56) =( 3/4 / 1/56 ) - ( 5/7 /1/56 ) = 42 - 40 = 2 望采纳

(1)0.25×8.75×4,=0.25×4×8.75,=100×8.75,=875;(2)25.8×7+3×25.8,=25.8×(7+3),=25.8×10,=258;(3)10÷0.2÷2.5,=10÷(0.2×2.5),=10÷0.5,=20;(4)21.36÷0.8-12.9,=26.7-12.9,=13.8.

(1) 8 9 ×[ 3 7 ÷( 2 3 + 1 7 )],= 8 9 ×[ 3 7 ÷ 17 21 ],= 8 9 × 9 17 ,= 8 17 ;(2)(873×477-198)÷(476×874+199),=[873×(476+1)-198]÷[476×(873+1)+199],=[873×476+873-198]÷[476×873+476+199],=[873×476+675]÷[476×873+...

①4.1÷0.41+22.5=10+22.5=32.5 ②2.01×99+2.01=2.01×(99+1)=2.01×100=201③5.6×3.9+3.9×4.4=3.9×(5.6+4.4)=3.9×10=39 ④6.9×1.25×0.8=6.9×(1.25×0.8)=6.9×1=6.9

(八)800-口00÷20=800-30=770;(2)39×八0八=39×(八00+八)=39×八00+39=3900+39=3939;(3)(八05×八2-口35)÷25=(八2口0-口35)÷25=口25÷25=25;(一)23×一5+23×55=23×(一5+55)=23×八00=2300;(5)25×八8×一=25×一×八8=八00×八8=八800...

①113+360÷24-18=113+15-18=128-18=110;②8.5×2.8+2.8×1.5=(8.5+1.5)×2.8=10×2.8=28;③(14+29)×36=14×36+29×36=9+8=17;④(13+12)÷(1-38)=56÷58=43.

(1)2.3+3.91÷(22-19.7)=2.3+3.91÷2.3=2.3+1.7=4(2)21.6÷[64.8-(48.6-2.7×2)]=21.6÷[64.8-(48.6-5.4)]=21.6÷[64.8-43.2]=21.6÷21.6=1(3)0.25×0.03×4 =(0.25×4)×0.03=1×0.03=0.030.13×3.89+0.13×5.11 =0.13×(3.89+5.11)=0.13×9=1....

( 120 - 8 X 6 ) / 3 = ( 3 X 40 - 8 X 2 X 3 ) / 3 = 3 X ( 8 X 5 - 8 X 2 ) / 3 = 8 X ( 5 - 2 ) = 8 X 3 = 24 82 + 17 X 6 - 132 = 102 - 50 = 52

①16×18-120÷15,=288-8,=280;②3.2×2.77+0.23×3.2,=3.2×(2.77+0.23),=3.2×3,=9.6;③7.6-2.05÷0.82,=7.6-2.5,=5.1;④78-517+98-1217,=(78+98)-(517+1217),=2-1,=1;⑤29-716×29,=29×(1-716),=29×916,=18;⑥13÷(14+56)×34,=...

(1)450÷18×25+173,=25×25+173,=625+173,=798;(2)670+65÷3×35,=670+65×(13×35),=670+65×15,=670+13,=683;(3)58-16×45+57,=58-215+57,=59120+57,=5759120;(4)38-12×6÷16,=38-72÷16,=38-4.5,=33.5.

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