题目内容
按要求解答下列各题
(1)计算:-22×(-5)+(1-32)÷4
(2)解方程:x-
=3+
.
(1)计算:-22×(-5)+(1-32)÷4
(2)解方程:x-
x+1 |
3 |
x+2 |
5 |
(1)-22×(-5)+(1-32)÷4
=-4×(-5)+(1-9)÷4
=20-8÷4
=20-2
=18;
(2)去分母得,15x-5(x+1)=45+3(x+2),
去括号得,15x-5x-5=45+3x+6,
移项得,15x-5x-3x=45+6+5,
合并同类项得,7x=56,
系数化为1得,x=8.
=-4×(-5)+(1-9)÷4
=20-8÷4
=20-2
=18;
(2)去分母得,15x-5(x+1)=45+3(x+2),
去括号得,15x-5x-5=45+3x+6,
移项得,15x-5x-3x=45+6+5,
合并同类项得,7x=56,
系数化为1得,x=8.
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