Toán Lớp 7: a,-2-370+(-8+370) a,46-x=-21-87 b,(443-x)-15=-96 c,(x-48)+499=3-(-281-534) d,25-(30+x)=x-(27-8) e,(x-12)-15=(20-7)-(18+x) HỨA CHO HAY N

Question

Toán Lớp 7:  a,-2-370+(-8+370) a,46-x=-21-87 b,(443-x)-15=-96 c,(x-48)+499=3-(-281-534) d,25-(30+x)=x-(27-8) e,(x-12)-15=(20-7)-(18+x) HỨA CHO HAY NHẤT NHA(càng nhanh càng tốt ạ)

tuyen98 · Answer

Giải đáp:       Lời giải và giải thích chi tiết:    a,-2-370+(-8+370)     &rArr; -2-370-8+370     &rArr;-2-8     &rArr;-10     a,46-x=-21-87     &hArr; 46-x= -108     &hArr; x = 46-(-108)     &hArr; x= 154     b,(443-x)-15=-96     &hArr; 443-x-15= -96     &hArr; 428-x=-96     &hArr; x = 428-(-96)     &hArr; x = 524    c,(x-48)+499=3-(-281-534)    &hArr; x-48+499=3+281+534     &hArr; x+451 = 818     &hArr; x = 818-451     &hArr;367     d,25-(30+x)=x-(27-8)    25-30-x=x-27+8   -5-x = x-19   -x-x = -19+5   -2x = -14   x =7    e,(x-12)-15=(20-7)-(18+x)     x-12-15=20-7-18-x     x-27= -5-x     x+x=-5+27     2x= 22     x =11

hoaiphuong85 · Answer

$a,-2-370+(-8+370)$   $=-2-370-8+370$   $=-2-8$   $=-10$      $a,46-x=-21-87$   $&hArr;46-x=-108$   $&hArr;x=46+108$   $&hArr;x=154$      $b,(443-x)-15=-96$   $&hArr;443-x-15=-96$   $&hArr;428-x=-96$   $&hArr;x=428+96$   $&hArr;x=524$      $c,(x-48)+499=3-(-281-534)$   $&hArr;x-48+499=3+281+534$   $&hArr;x+451=818$   $&hArr;x=367$      $d,25-(30+x)=x-(27-8)$   $&hArr;25-30-x=x-27+8$   $&hArr;-2x=-14$   $&hArr;x=7$      $e,(x-12)-15=(20-7)-(18+x)$   $&hArr;x-12-15=20-7-18-x$   $&hArr;2x=22$   $&hArr;x=11$