问题
解答题
解方程:
4x-18×2=20;
2y÷4=17.4;
2.9x+x=78.
答案
(1)4x-18×2=20,
4x-36=20,
4x-36+36=20+36,
4x÷4=56÷4,
x=14;
(2)2y÷4=17.4,
2y÷4×4=17.4×4,
2y÷2=69.6÷2,
y=34.8;
(3)2.9x+x=78,
3.9x=78,
3.9x÷3.9=78÷3.9,
x=20.
解方程:
4x-18×2=20;
2y÷4=17.4;
2.9x+x=78.
(1)4x-18×2=20,
4x-36=20,
4x-36+36=20+36,
4x÷4=56÷4,
x=14;
(2)2y÷4=17.4,
2y÷4×4=17.4×4,
2y÷2=69.6÷2,
y=34.8;
(3)2.9x+x=78,
3.9x=78,
3.9x÷3.9=78÷3.9,
x=20.