简便计算:3/7-1/3×3/8 18×(2/3+4/9-5/6)
3个回答
3/7-1/3×3/8
=3/7-1/8
=24/56-7/56
=17/56
18×(2/3+4/9-5/6)
=18×2/3+18×4/9-18×5/6
=12+8-15
=5
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4.2×6.7+6.7×1.2+3.3×5.4简便计算
计算下列各题. 3×4+2= 4×3+5= 3×6+4= 8×9+7= 4×7-6= 2×9-8= 3×8-4= 4×9
计算(1)2-(-7)-18+(-7)(2)-2.5×(-40)(3)18-9÷3×(-[1/3])(4)-3×5+20
6÷1/4=18×5/6=3/4×3/5=4/9÷8/9=7/6×3/14=