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2/5×括号1/5+8/21÷(4/7)括号脱式计算

2/5×[1/5+8/21÷(4/7)] =2/5x(1/5+2/3) =2/5x(13/15) =26/75

(1)21.6-0.8×4÷0.8×4,=21.6-(0.8÷0.8)×(4×4),=21.6-1×16,=21.6-16,=5.6;(2)2.1×0.5÷4.2,=1.05÷4.2,=0.25;(3) 3 4 ×( 1 2 ÷ 5 8 ),= 3 4 × 4 5 ,= 3 5 ;(4) 8 9 ×[ 3 4 -( 7 16 - 1 4 )],= 8 9 ×[ 3 4 - 7 16 + 1 4...

2\3+7\12+3\10+9\20。 =1又1/4+(3/10+9/20) =1又1/4+3/4 =2 14\21-4\7+5\6 =2/21+5/6 =13/14 1又7\15-8\1-8\7+8\15 =1又7\15+8\15-(8\1+8\7) =2-1 =1

1.3/7 × 49/9 - 4/3 2.8/9 × 15/36 + 1/27 3.12× 5/6 – 2/9 ×3 4.8× 5/4 + 1/4 5.6÷ 3/8 – 3/8 ÷6 6.4/7 × 5/9 + 3/7 × 5/9 7.5/2 -( 3/2 + 4/5 ) 8.7/8 + ( 1/8 + 1/9 ) 9.9 × 5/6 + 5/6 10.3/4 × 8/9 - 1/3 11.7 × 5/49 + 3/14 12.6 ×( 1...

1.3/7 × 49/9 - 4/3 2.8/9 × 15/36 + 1/27 3.12× 5/6 – 2/9 ×3 4.8× 5/4 + 1/4 5.6÷ 3/8 – 3/8 ÷6 6.4/7 × 5/9 + 3/7 × 5/9 7.5/2 -( 3/2 + 4/5 ) 8.7/8 + ( 1/8 + 1/9 ) 9.9 × 5/6 + 5/6 10.3/4 × 8/9 - 1/3 11.7 × 5/49 + 3/14 12.6 ×( 1...

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