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11+(—35)—4×(—6)
(1)(-35)+38+(-15)+12;
(2)8.2+(-7.8)+9.8+(-12.2);
(3);
(4)3.7+4.2+(-3.7)+(-7.2);
(5).
2.035(2x+1)+0.65(x-1)=0.035(2x+1)+0.35(1-x)
计算(x+5)(x-7)的结果是
x2-12x-35
x2+12x-35
x2-2x-35
x2+2x-35