5/7-5/9×5/7=1-57×21/25=1/2+5/4×4/5= 亲,请看问题补充1/6×(5-2/3)= 7/8
6个回答
=5/7X(1-5/9)
=5/7X4/9
=20/63
希望能帮你忙,懂了请采纳,
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判断 1、5.7×10.2=5.7×10+5.7×2=68.4 2、2.9×8×1.25=2.9×(8×1.25)运用了
判断 1、5.7×10.2=5.7×10+5.7×2=68.4 2、2.9×8×1.25=2.9×(8×1.25)运用了
如何计算下题: 1×2×3+2×3×4+3×4×5+4×5×6+5×6×7+6×7×8+7×8×9+……+n×(n+1)
5×3= 4×3= 2×9= 7×2= 18÷6= 15÷5 40÷5= 21÷7= 4×4= 8×4= 4×7= 5×
简便计算. 4 5 × 3 8 + 4 5 × 1 2 (3× 5 12 )×4 3 7 × 2 9 × 7 8 4 9
1.5×5/8+7×5/82.3/4×5/7-3/4×1/73.7/8×3/17×5/74.11/19×2/7×5/11