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脱式计算(能简算的要简算) ( 4 5 ...

(1) 4 5 - 4 5 ÷ 2 3 × 1 2 = 4 5 - 4 5 × 3 2 × 1 2 = 4 5 - 3 5 = 1 5 ;(2)( 2 3 + 4 15 )×15= 14 15 ×15=14;(3)12.87+3.65+1.35=12.87+(3.65+1.35)=12.87+5=17.87;(4)74.6×19+19×25.4=(74.6+25.4)×19=100×19=1900;(5)【...

①14.37-5.63-4.37,=14.37-(5.63+4.37),=14.37-10,=4.37;②5÷13+27×113+713,=513+2713+713,=3;③117×49+517×19,=117×49+117×59,=117×(49+59),=117;④56×[(34-12)÷35],=56×[14×53],=56×512,=2572.

①12.5×0.4×2.5×8=(12.5×8)×(0.4×2.5)=100×1=100②9.5×101=9.5×(100+1)=9.5×100+9.5=959.5③43.2-1.8×3-4.6=43.2-5.4-4.6=43.2-(5.4+4.6)=33.2④4.2×7.8+2.2×4.2=4.2×(7.8+2.2)=4.2×10=42⑤0.87×3.16+4.64=2.7492+4.64=7.3892⑥12.5×4.8=12....

脱式计算能简算的要简算 0.25x32x12.5 =(0.25×4)×(8×12.5) =1×100 =100 2/5x68+0.4x32 =0.4×(68+32) =0.4×100 =40 14/5÷(14/5+7/10) =14/5÷7/2 =4/5 (2/3+4/15x5/6)÷10/21 =(2/3+2/9)÷10/21 =8/9÷10/21 =28/15 1-5/8÷25/28-3/10 =1-...

(1)62.8×19-8× 62 4 5 - 62 4 5 ,=62.8×(19-8-1),=62.8×10,=628;(2)3.64×[1÷(2 1 10 -2.09)],=3.64×[1÷0.01],=3.64×100,=364;(3)1800-1350÷18×6,=1800-75×6,=1800-450,=1350;(4)( 2 5 12 +1 5 8 +2 7 12 +3.375)× 3 ...

5/8x3/4 + 1/4ⅹ5/8 =(3/4 +1/4)×5/8 =5/8

(8)84+27×84+y7÷4,=84+27×84+y7×84,=(8+27+y7)×84,=2×84,=82;(2)82.4-2.4×3.7y÷2.y,=82.4-七÷2.y,=82.4-3.6,=8.8;(3)2.y×2y-0.28÷83+七.63,=8-0.63+七.63,=8+(七.63-0.63),=8+七,=80;(4)8七七七+七七七×七七七,=8000...

(1)33.5-5.3-4.7+16.5,=(33.5+16.5)-(5.3+4.7),=50-10,=40;(2)9900÷25÷4,=9900÷(25×4),=9900÷100,=99;(3)1÷( 3 5 + 3 10 ),=1÷ 9 10 ,= 10 9 ;(4)24×( 2 3 + 1 6 - 3 8 ),=24× 2 3 +24× 1 6 -24× 3 8 ,=16+4-9...

(1)762-408÷4×5,=762-102×5,=762-510,=252;(2)35×27+57×14,=10+10,=20;(3)1.5×[0.02÷(2.1-2.09)],=1.5×[0.02÷0.01],=1.5×2,=3;(4)12.5×8.8,=12.5×(8+0.8),=12.5×8+12.5×0.8,=100+10,=110;(5)87.58-(7.58+3.8),...

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