
计算26+(-14)+(-16)+8(-5.5)+(-3.2)-(-2.5)-4.812(x-1)=2-15(x+2)x+10.2-3x-10.4=1(-1)
计算26+(-14)+(-16)+8(-5.5)+(-3.2)-(-2.5)-4.812(x-1)=2-15(x+2)x+10.2-3x-10.4=1(-1)÷(13-1...
计算26+(-14)+(-16)+8(-5.5)+(-3.2)-(-2.5)-4.812(x-1)=2-15(x+2)x+10.2-3x-10.4=1(-1)÷(13-12)12+(-3)2×(-12).
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①26+(-14)+(-16)+8
=(26+8)+(-30)
=34-30
=4
②(-5.5)+(-3.2)-(-2.5)-4.8
=-5.5-3.2+2.5-4.8
=-8.7+2.5-4.8
=-6.2-4.8
=-11
③
(x-1)=2-
(x+2)
0.5x-0.5=2-0.2x-0.4
0.5x-0.5+0.5=2-0.2x+0.5-0.4
0.5x=2.1-0.2x
0.5x+0.2x=2.1+0.2x-0.2x
0.7x=2.1
0.7x÷0.7=2.1÷0.7
x=3
④
-
=1
-
=1
-
=1
×0.4=1×0.4
-x+3=0.4
x=2.6
⑤(-1)÷(
-
)
=(-1)÷(-
)
=6
⑥
+(-3)2×(-
)
=
+9×(-
)
=
-
=-4
=(26+8)+(-30)
=34-30
=4
②(-5.5)+(-3.2)-(-2.5)-4.8
=-5.5-3.2+2.5-4.8
=-8.7+2.5-4.8
=-6.2-4.8
=-11
③
1 |
2 |
1 |
5 |
0.5x-0.5=2-0.2x-0.4
0.5x-0.5+0.5=2-0.2x+0.5-0.4
0.5x=2.1-0.2x
0.5x+0.2x=2.1+0.2x-0.2x
0.7x=2.1
0.7x÷0.7=2.1÷0.7
x=3
④
x+1 |
0.2 |
3x-1 |
0.4 |
2×(x+1) |
0.2×2 |
3x-1 |
0.4 |
2x+2 |
0.4 |
3x-1 |
0.4 |
2x+2-3x+1 |
0.4 |
-x+3=0.4
x=2.6
⑤(-1)÷(
1 |
3 |
1 |
2 |
=(-1)÷(-
1 |
6 |
=6
⑥
1 |
2 |
1 |
2 |
=
1 |
2 |
1 |
2 |
=
1 |
2 |
9 |
2 |
=-4
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