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计算下面各题,能简算的要简算.(1)9.86%3.4÷1.7...

(1)9.86-3.4÷1.7×1.3,=9.86-2×1.3,=9.86-2.6,=7.26;(2)0.36×3.9+3.9×1.64,=3.9×(0.36+1.64),=3.9×2,=7.8;(3)7.23-(2.8+1.23),=7.23-1.23-2.8,=6-2.8,=3.2;(4)1.64×2.5+2.1÷0.6,=4.1+3.5,=7.6;(5)2.4×(0.85÷1.7)-...

(1)1.8×(4.7-3.87÷0.9),=1.8×(4.7-4.3),=1.8×0.4,=0.72;(2)7.28-3.14+1.72-2.86,=(7.28+1.72)-(3.14+2.86),=9-6,=3;(3)4×0.8×2.5×12.5,=(4×2.5)×(0.8×12.5),=10×10,=100;(4)0.65×14+87×65%-65%,=0.65×14+87×0...

(1)64%×7+36%×7,=(64%+36%)×7,=1×7,=7;(2) 2 3 ÷( 2 3 -60%)÷40%,= 2 3 ÷ 1 15 ÷40%,=10÷40%,=25;(3)8×40%+ 2 5 ÷ 1 2 ,=8×40%+40%×2,=(8+2)×40%,=10×40%,=4;(4)4.15-3.15×10%- 5 8 ,=4.15-0.315- 5 8 ,=3.835- 5...

(1)1.29+3.7+2.71+6.3,=(1.29+2.71)+(3.7+6.3),=4+10,=14;(2)3.75÷[0.3×(1.34-0.84)],=3.75÷[0.3×0.5],=3.75÷0.15,=25;(3)7.2×7.2+7.2×2.8,=7.2×(7.2+2.8),=7.2×10,=72;(4)0.25×0.8×0.125×4,=(0.25×4)×(0.125×0...

(1)3.6-2.84+7.4-7.2,=(3.6+7.4)-(2.84+7.2),=11-10.04,=0.96;(2)(4-0.2)÷1.9+0.1,=3.8÷1.9+0.1,=2+0.1,=2.1;(3)429×[1?(34?38)],=429×[1?38],=429×58,=558;(4)817÷23+123×917,=817×123+123×917,=(817+917)×123,...

(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)936+250×16,=936+4000,=4936;(2)7.2-2.7÷15-0.32,=7.2-0.18-0.32,=7.2-(0.18+0.32),=7.2-0.5,=6.7;(3)38×31+1÷83,=38×31+1×38,=38×(31+1)=38×32,=12;(4))910÷[12×(56?310)],=910÷[12×815],=910÷415,=278.

(1)3.07×101-3.07 =3.07×100+3.07-3.07,=307;(2)4.56+ 3 7 +4.44+ 4 7 =(4.56+4.44)+( 3 7 + 4 7 ),=9+1,=10;(3)1.25×3.2×2.5=(1.25×0.8)×(2.5×4),=1×10,=10;(4) 5 9 -( 5 6 - 7 12 ) = 5 9 - 1 4 ,= 11 36 ;(5)[...

(1)(125+ 7 32 )×8,=125×8+ 7 32 ×8,=1000+1.75,=1001.75;(2) 19 4 ×20%+ 19 4 × 4 5 ,= 19 4 ×(20%+ 4 5 ),= 19 4 ×1,= 19 4 ;(3)25×32×125,=25×(4×8)×125,=(25×4)×(8×125),=100×1000,=100000;(4)99× 1 100 ,...

(1)1.25×32×2.5=1.25×(8×4)×2.5=(1.25×8)×(4×2.5)=10×10=100(2) 3 4 + 1 4 × 4 7 = 3 4 + 1 7 = 25 28 (3)7.38-(1.57+2.38)=7.38-1.57-2.38=7.38-2.38-1.57=5-1.57=3.43(4) 9 10 + 9 10 ×99= 9 10 ×(1+99)=0.9×100=90(5) 1...

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