题目
计算
(1)
﹣40﹣28﹣(﹣19)+(﹣24)
(2)
﹣82+3×(﹣2)2+6÷(﹣ )2
(3)
﹣24×(﹣ + ﹣ )
(4)
﹣12016﹣(1﹣0.5)× ×[3﹣(﹣3)2]
(5)
x+7x﹣5x
(6)
﹣4x2y+3xy2﹣9x2y﹣5xy2
(7)
4(2x2﹣y2)﹣5(3y2﹣x2)
答案: 解:﹣40﹣28﹣(﹣19)+(﹣24) =﹣40﹣28+19﹣24=﹣73
解:﹣82+3×(﹣2)2+6÷(﹣ 13 )2=﹣64+12+ 23 =﹣51 13
解:﹣24×(﹣ 56 + 38 ﹣ 112 ) =﹣24× (−56)−24×38−24×(−112) =20﹣9+2=13
解:﹣12016﹣(1﹣0.5)× 13 ×[3﹣(﹣3)2] = −1−12×13×(−16) =﹣1+1=0
解:x+7x﹣5x =3x
解:﹣4x2y+3xy2﹣9x2y﹣5xy2=﹣x2y+5xy2
解:4(2x2﹣y2)﹣5(3y2﹣x2) =8x2﹣4y2﹣15y2+5x2=13x2﹣19y2